Empathy List Archives

GD

Gregory Dumond

Thu, Sep 26, 2019 9:02 PM

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
"There is not enough darkness in all the world to put out the light of even one small candle."
--- Robert Alden

Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden

MF

Mazdab, Frank K - (fmazdab)

Fri, Sep 27, 2019 11:19 AM

Hi Greg,

All zirconium minerals contain some hafnium, as the two elements are very chemically similar and indeed are even difficult to separate for industrial purposes; the natural ratio is commonly that Hf is roughly about 1-2% of Zr, but in highly-fractionated pegmatites, Hf/Zr increases and in rare cases Hf can even exceed Zr (as in the mineral hafnon, the hafnium equivalent of zircon). Otherwise, Zr-rich minerals like eudialyte, elpidite, catapleiite, kimzeyite, baddeleyite, zirconolite, etc. (just do a search by chemistry on mindat.orghttp://mindat.org or on webmineral.comhttp://webmineral.com for minerals containing Zr… there are about 130 of them) should all almost certainly have Hf concentrations greater than 10’s of ppm, and likely even values in the X000-X0000 ppm range.. Even minerals like aegirine, arfvedsonite, astrophyllite and titanite, for example, which aren’t Zr minerals but in certain parageneses can have significant Zr enrichments, would also likely have Hf at or greater than 10’s of ppm in those particular very Zr-enriched examples.

Frank

On 26 Sep 2019, at 14:02:36, Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu> wrote:

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu mailto:gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
"There is not enough darkness in all the world to put out the light of even one small candle."
--- Robert Alden

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Frank K. Mazdab
analytical mineralogist
Department of Geosciences
1040 E. 4th St., Gould-Simpson Bldg. (Bldg. 77)
University of Arizona
Tucson, AZ 85721

fmazdab@arizona.edu mailto:fmazdab@arizona.edu
office: rm 342 Gould-Simpson Bldg.

www.rockptx.com

Idiocracy is a documentary

Hi Greg, All zirconium minerals contain some hafnium, as the two elements are very chemically similar and indeed are even difficult to separate for industrial purposes; the natural ratio is commonly that Hf is roughly about 1-2% of Zr, but in highly-fractionated pegmatites, Hf/Zr increases and in rare cases Hf can even exceed Zr (as in the mineral hafnon, the hafnium equivalent of zircon). Otherwise, Zr-rich minerals like eudialyte, elpidite, catapleiite, kimzeyite, baddeleyite, zirconolite, etc. (just do a search by chemistry on mindat.org<http://mindat.org> or on webmineral.com<http://webmineral.com> for minerals containing Zr… there are about 130 of them) should all almost certainly have Hf concentrations greater than 10’s of ppm, and likely even values in the X000-X0000 ppm range.. Even minerals like aegirine, arfvedsonite, astrophyllite and titanite, for example, which aren’t Zr minerals but in certain parageneses can have significant Zr enrichments, would also likely have Hf at or greater than 10’s of ppm in those particular very Zr-enriched examples. Frank On 26 Sep 2019, at 14:02:36, Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> wrote: Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu<mailto:gdumond@uark.edu> Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden _______________________________________________ MSA-talk mailing list MSA-talk@minlists.org<mailto:MSA-talk@minlists.org> http://lists.minlists.org/mailman/listinfo/msa-talk ****************************************************** Frank K. Mazdab analytical mineralogist Department of Geosciences 1040 E. 4th St., Gould-Simpson Bldg. (Bldg. 77) University of Arizona Tucson, AZ 85721 fmazdab@arizona.edu<mailto:fmazdab@arizona.edu> office: rm 342 Gould-Simpson Bldg. www.rockptx.com ************************************************************************************** Idiocracy is a documentary **************************************************************************************

JP

JOHN PAINE

Fri, Sep 27, 2019 1:28 PM

Greg: ALL zirconium minerals contain low levels of hafnium, usually around two percent by weight of the zirconium content. Most zirconium chemicals in commerce come with their original hafnium content, since the chemical behavior of the two are nearly identical. It takes costly solvent extraction to rid zirconium of hafnium commercially, and the bulk of hafnium-free zirconium gets used in nuclear reactors, where the hafnium has to be gone, due to its high absorption ability for thermal neutrons. Easily available alternative zirconium minerals include baddeleyite and eudialyte and friends (ferrokentbrooksite, etc.). The inexpensive source of high purity hafnium and zirconium chemicals is Wah Chang. John B. Paine III

On September 26, 2019 at 5:02 PM Gregory Dumond gdumond@uark.edu wrote:

 Hello Folks,

 Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

 Thanks for your consideration!

 Greg

  
 -----
 Gregory Dumond
 Associate Professor
 Department of Geosciences
 University of Arkansas
 Fayetteville, AR 72701, USA
 Email: gdumond@uark.edu
 Web:  https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
 "There is not enough darkness in all the world to put out the light of even one small candle."
                --- Robert Alden

 MSA-talk mailing list
 MSA-talk@minlists.org
 http://lists.minlists.org/mailman/listinfo/msa-talk

Greg: ALL zirconium minerals contain low levels of hafnium, usually around two percent by weight of the zirconium content. Most zirconium chemicals in commerce come with their original hafnium content, since the chemical behavior of the two are nearly identical. It takes costly solvent extraction to rid zirconium of hafnium commercially, and the bulk of hafnium-free zirconium gets used in nuclear reactors, where the hafnium has to be gone, due to its high absorption ability for thermal neutrons. Easily available alternative zirconium minerals include baddeleyite and eudialyte and friends (ferrokentbrooksite, etc.). The inexpensive source of high purity hafnium and zirconium chemicals is Wah Chang. John B. Paine III > On September 26, 2019 at 5:02 PM Gregory Dumond <gdumond@uark.edu> wrote: > > Hello Folks, > > Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? > > Thanks for your consideration! > > Greg > > > ----- > Gregory Dumond > Associate Professor > Department of Geosciences > University of Arkansas > Fayetteville, AR 72701, USA > Email: gdumond@uark.edu > Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ > "There is not enough darkness in all the world to put out the light of even one small candle." > --- Robert Alden > > > _______________________________________________ > MSA-talk mailing list > MSA-talk@minlists.org > http://lists.minlists.org/mailman/listinfo/msa-talk >

JG

John Gittins

Fri, Sep 27, 2019 3:07 PM

Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don’t think anyone ever looked at how much Hf it has.

In jest
John Gittins
University of Toronto

Sent from my iPad

On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu> wrote:

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu mailto:gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
"There is not enough darkness in all the world to put out the light of even one small candle."
--- Robert Alden

MSA-talk mailing list
MSA-talk@minlists.org mailto:MSA-talk@minlists.org
http://lists.minlists.org/mailman/listinfo/msa-talk

Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don’t think anyone ever looked at how much Hf it has. In jest John Gittins University of Toronto Sent from my iPad On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> wrote: Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu<mailto:gdumond@uark.edu> Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden _______________________________________________ MSA-talk mailing list MSA-talk@minlists.org<mailto:MSA-talk@minlists.org> http://lists.minlists.org/mailman/listinfo/msa-talk

MJ

Mary Johnson

Fri, Sep 27, 2019 3:24 PM

Hafnon, for one.

On September 26, 2019 at 5:02 PM Gregory Dumond gdumond@uark.edu wrote:

 Hello Folks,

 Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

 Thanks for your consideration!

 Greg

 -----
 Gregory Dumond
 Associate Professor
 Department of Geosciences
 University of Arkansas
 Fayetteville, AR 72701, USA
 Email: gdumond@uark.edu
 Web:  https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
 "There is not enough darkness in all the world to put out the light of even one small candle."
                --- Robert Alden

 MSA-talk mailing list
 MSA-talk@minlists.org
 http://lists.minlists.org/mailman/listinfo/msa-talk

Hafnon, for one. > On September 26, 2019 at 5:02 PM Gregory Dumond <gdumond@uark.edu> wrote: > > Hello Folks, > > Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? > > Thanks for your consideration! > > Greg > > ----- > Gregory Dumond > Associate Professor > Department of Geosciences > University of Arkansas > Fayetteville, AR 72701, USA > Email: gdumond@uark.edu > Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ > "There is not enough darkness in all the world to put out the light of even one small candle." > --- Robert Alden > > > _______________________________________________ > MSA-talk mailing list > MSA-talk@minlists.org > http://lists.minlists.org/mailman/listinfo/msa-talk >

GD

Gregory Dumond

Fri, Sep 27, 2019 7:05 PM

Hello Folks,

Thanks for all the input. I also just discovered what looks to be a great paper by Fernando Bea:

Bea, F., 2006, A LA-ICP-MS evaluation of Zr Reservoirs in common crustal rocks: Implications for Zr and Hf geochemistry and zircon-forming processes, vol. 44, p. 693-714.

His Table 1 provides a set of data for Zr and Hf in a large suite of minerals.

Best regards!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/
"There is not enough darkness in all the world to put out the light of even one small candle."
--- Robert Alden

From: Gregory Dumond
Sent: Thursday, September 26, 2019 4:02 PM
To: msa-talk@minlists.org msa-talk@minlists.org
Subject: Hafnium-bearing minerals other than zircon

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/

"There is not enough darkness in all the world to put out the light of even one small candle."

           --- Robert Alden

Hello Folks, Thanks for all the input. I also just discovered what looks to be a great paper by Fernando Bea: Bea, F., 2006, A LA-ICP-MS evaluation of Zr Reservoirs in common crustal rocks: Implications for Zr and Hf geochemistry and zircon-forming processes, vol. 44, p. 693-714. His Table 1 provides a set of data for Zr and Hf in a large suite of minerals. Best regards! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden ________________________________ From: Gregory Dumond Sent: Thursday, September 26, 2019 4:02 PM To: msa-talk@minlists.org <msa-talk@minlists.org> Subject: Hafnium-bearing minerals other than zircon Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden

GJ

Garrison, Jennifer M.

Fri, Sep 27, 2019 8:26 PM

Maybe garnet?

-Jen

Jennifer M. Garrison, Ph.D.
Director, Natural Science Program
Professor, Dept. of Geosciences & Environment
CSU Los Angeles
LaKretz Hall 159, 323-343-2412

http://web.calstatela.edu/faculty/jgarris/

From: msa-talk-bounces@minlists.org msa-talk-bounces@minlists.org on behalf of John Gittins j.gittins@utoronto.ca
Sent: Friday, September 27, 2019 8:07 AM
To: Gregory Dumond gdumond@uark.edu
Cc: msa-talk@minlists.org msa-talk@minlists.org
Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon

Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don’t think anyone ever looked at how much Hf it has.

In jest
John Gittins
University of Toronto

Sent from my iPad

On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu> wrote:

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu mailto:gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/

"There is not enough darkness in all the world to put out the light of even one small candle."

           --- Robert Alden

MSA-talk mailing list
MSA-talk@minlists.org mailto:MSA-talk@minlists.org
http://lists.minlists.org/mailman/listinfo/msa-talk

Maybe garnet? -Jen Jennifer M. Garrison, Ph.D. Director, Natural Science Program Professor, Dept. of Geosciences & Environment CSU Los Angeles LaKretz Hall 159, 323-343-2412 http://web.calstatela.edu/faculty/jgarris/ ________________________________ From: msa-talk-bounces@minlists.org <msa-talk-bounces@minlists.org> on behalf of John Gittins <j.gittins@utoronto.ca> Sent: Friday, September 27, 2019 8:07 AM To: Gregory Dumond <gdumond@uark.edu> Cc: msa-talk@minlists.org <msa-talk@minlists.org> Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don’t think anyone ever looked at how much Hf it has. In jest John Gittins University of Toronto Sent from my iPad On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> wrote: Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu<mailto:gdumond@uark.edu> Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/ "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden _______________________________________________ MSA-talk mailing list MSA-talk@minlists.org<mailto:MSA-talk@minlists.org> http://lists.minlists.org/mailman/listinfo/msa-talk

MA

Moeller, Andreas

Sun, Sep 29, 2019 9:49 PM

Hi all, my two cents,
The Zr-Hf connection is important, if the goal is Hf isotope information, then the key is Hf vs HREE.
Zircon is ideal because it has low Lu-Hf ratios, Hf is very un-radiogenic, preserves the isotope ratio at crystallization, withHf at wt% concentration but in comparison low HREE (even though up several 1000 times chondritic). Moderate isobaric interference one HREE on Hf isotopes.
Garnet is on the other end of the spectrum, very high Lu-Hf, mostly radiogenic Hf from Lu decay. High HREE-Hf ratio and therefore high amount of interferences.
Rutile has been shown to be viable of Hf isotopic ratios, e.g. see the papers by Tanya Ewing. Almost no HREE, therefore almost no isobaric interference on Hf, but relatively low Hf concentrations. Since Hf correlates with Zr incorporation, the Hf concentration is T-dependent.
So more exotic Zr mineral may be a go, but beware of HREE content.
Choose your poison, good luck,
Andreas

Dr. Andreas Möller
Associate Professor - Geochronology
The University of Kansas
Department of Geology - IGL
1420 Naismith Drive, Slawson Hall, Room 170G
Lawrence, KS 66045

USA -
+1 (785) 864-1447 (voicemail)
http://www.geo.ku.edu/möller-andreas http://www.geo.ku.edu/m%C3%B6ller-andreas

From: <msa-talk-bounces@minlists.org mailto:msa-talk-bounces@minlists.org> on behalf of "Garrison, Jennifer M." <jgarris@exchange.calstatela.edu mailto:jgarris@exchange.calstatela.edu>
Date: Friday, September 27, 2019 at 3:26 PM
To: John Gittins <j.gittins@utoronto.ca mailto:j.gittins@utoronto.ca>, Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu>
Cc: "msa-talk@minlists.org mailto:msa-talk@minlists.org" <msa-talk@minlists.org mailto:msa-talk@minlists.org>
Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon

Maybe garnet?

-Jen

Jennifer M. Garrison, Ph.D.
Director, Natural Science Program
Professor, Dept. of Geosciences & Environment
CSU Los Angeles
LaKretz Hall 159, 323-343-2412

http://web.calstatela.edu/faculty/jgarris/https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fweb.calstatela.edu%2Ffaculty%2Fjgarris%2F&data=02%7C01%7Camoller%40ku.edu%7C03c3eb5851d540b4b7d208d744295103%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C637052816569075832&sdata=ewR7OrvnaIeLf37aVDUmo%2FtIBZpNu%2B65eYRZJ%2FuqzIc%3D&reserved=0

From: msa-talk-bounces@minlists.org mailto:msa-talk-bounces@minlists.org <msa-talk-bounces@minlists.org mailto:msa-talk-bounces@minlists.org> on behalf of John Gittins <j.gittins@utoronto.ca mailto:j.gittins@utoronto.ca>
Sent: Friday, September 27, 2019 8:07 AM
To: Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu>
Cc: msa-talk@minlists.org mailto:msa-talk@minlists.org <msa-talk@minlists.org mailto:msa-talk@minlists.org>
Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon

Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don't think anyone ever looked at how much Hf it has.

In jest
John Gittins
University of Toronto

Sent from my iPad

On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu mailto:gdumond@uark.edu> wrote:

Hello Folks,

Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium?

Thanks for your consideration!

Greg

Gregory Dumond
Associate Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: gdumond@uark.edu mailto:gdumond@uark.edu
Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffulbright.uark.edu%2Fdepartments%2Fgeosciences%2Fdirectory%2Findex%2Fuid%2Fgdumond%2Fname%2FGregory%2BDumond%2F&data=02%7C01%7Camoller%40ku.edu%7C03c3eb5851d540b4b7d208d744295103%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C637052816569075832&sdata=ZSD2Ag9Lk0b5AUJ8%2FQrwK7vReoDPGuw3Tew2hCq1J%2BU%3D&reserved=0

"There is not enough darkness in all the world to put out the light of even one small candle."

           --- Robert Alden

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Hi all, my two cents, The Zr-Hf connection is important, if the goal is Hf isotope information, then the key is Hf vs HREE. Zircon is ideal because it has low Lu-Hf ratios, Hf is very un-radiogenic, preserves the isotope ratio at crystallization, withHf at wt% concentration but in comparison low HREE (even though up several 1000 times chondritic). Moderate isobaric interference one HREE on Hf isotopes. Garnet is on the other end of the spectrum, very high Lu-Hf, mostly radiogenic Hf from Lu decay. High HREE-Hf ratio and therefore high amount of interferences. Rutile has been shown to be viable of Hf isotopic ratios, e.g. see the papers by Tanya Ewing. Almost no HREE, therefore almost no isobaric interference on Hf, but relatively low Hf concentrations. Since Hf correlates with Zr incorporation, the Hf concentration is T-dependent. So more exotic Zr mineral may be a go, but beware of HREE content. Choose your poison, good luck, Andreas -------------- Dr. Andreas Möller Associate Professor - Geochronology The University of Kansas Department of Geology - IGL 1420 Naismith Drive, Slawson Hall, Room 170G Lawrence, KS 66045 - USA - +1 (785) 864-1447 (voicemail) http://www.geo.ku.edu/möller-andreas<http://www.geo.ku.edu/m%C3%B6ller-andreas> From: <msa-talk-bounces@minlists.org<mailto:msa-talk-bounces@minlists.org>> on behalf of "Garrison, Jennifer M." <jgarris@exchange.calstatela.edu<mailto:jgarris@exchange.calstatela.edu>> Date: Friday, September 27, 2019 at 3:26 PM To: John Gittins <j.gittins@utoronto.ca<mailto:j.gittins@utoronto.ca>>, Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> Cc: "msa-talk@minlists.org<mailto:msa-talk@minlists.org>" <msa-talk@minlists.org<mailto:msa-talk@minlists.org>> Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon Maybe garnet? -Jen Jennifer M. Garrison, Ph.D. Director, Natural Science Program Professor, Dept. of Geosciences & Environment CSU Los Angeles LaKretz Hall 159, 323-343-2412 http://web.calstatela.edu/faculty/jgarris/<https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fweb.calstatela.edu%2Ffaculty%2Fjgarris%2F&data=02%7C01%7Camoller%40ku.edu%7C03c3eb5851d540b4b7d208d744295103%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C637052816569075832&sdata=ewR7OrvnaIeLf37aVDUmo%2FtIBZpNu%2B65eYRZJ%2FuqzIc%3D&reserved=0> ________________________________ From: msa-talk-bounces@minlists.org<mailto:msa-talk-bounces@minlists.org> <msa-talk-bounces@minlists.org<mailto:msa-talk-bounces@minlists.org>> on behalf of John Gittins <j.gittins@utoronto.ca<mailto:j.gittins@utoronto.ca>> Sent: Friday, September 27, 2019 8:07 AM To: Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> Cc: msa-talk@minlists.org<mailto:msa-talk@minlists.org> <msa-talk@minlists.org<mailto:msa-talk@minlists.org>> Subject: Re: [MSA-talk] Hafnium-bearing minerals other than zircon Well, there are lots of other zirconium minerals. I should imagine they are all candidates. At risk of sounding pompous, try Gittinsite. It tops 40% ZrO2 but I don't think anyone ever looked at how much Hf it has. In jest John Gittins University of Toronto Sent from my iPad On Sep 27, 2019, at 6:08 AM, Gregory Dumond <gdumond@uark.edu<mailto:gdumond@uark.edu>> wrote: Hello Folks, Apart from zircon, what other minerals contain appreciable amounts (10s of ppm or more) of hafnium? Thanks for your consideration! Greg ----- Gregory Dumond Associate Professor Department of Geosciences University of Arkansas Fayetteville, AR 72701, USA Email: gdumond@uark.edu<mailto:gdumond@uark.edu> Web: https://fulbright.uark.edu/departments/geosciences/directory/index/uid/gdumond/name/Gregory+Dumond/<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffulbright.uark.edu%2Fdepartments%2Fgeosciences%2Fdirectory%2Findex%2Fuid%2Fgdumond%2Fname%2FGregory%2BDumond%2F&data=02%7C01%7Camoller%40ku.edu%7C03c3eb5851d540b4b7d208d744295103%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C637052816569075832&sdata=ZSD2Ag9Lk0b5AUJ8%2FQrwK7vReoDPGuw3Tew2hCq1J%2BU%3D&reserved=0> "There is not enough darkness in all the world to put out the light of even one small candle." --- Robert Alden _______________________________________________ MSA-talk mailing list MSA-talk@minlists.org<mailto:MSA-talk@minlists.org> http://lists.minlists.org/mailman/listinfo/msa-talk<https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.minlists.org%2Fmailman%2Flistinfo%2Fmsa-talk&data=02%7C01%7Camoller%40ku.edu%7C03c3eb5851d540b4b7d208d744295103%7C3c176536afe643f5b96636feabbe3c1a%7C0%7C0%7C637052816569085825&sdata=SQA8uem5QCAboQLexsR4%2BtJ7lCbL%2FZGnwxVj8016pMw%3D&reserved=0>