Hi Dexter, The following article is a good start: *The blue road: Provenance study of azurite samples from historical locations through the analysis of minor and trace elements* It can be found here: https://pmc.ncbi.nlm.nih.gov/articles/PMC10469567/ Cheers, Herwig Op zo 26 apr 2026 om 09:30 schreef <msa-talk-request@minlists.org>: > Date: Thu, 23 Apr 2026 18:15:43 +0000 > From: "Perkins, Dexter" <dexter.perkins@und.edu> > Subject: [MSA-talk] azurite and malachite > To: "msa-talk@minlists.org" <msa-talk@minlists.org> > > Does anyone know where I can track down analyses of natural azurite? > Malachite, too, but azurite is the of most importance. > > Dexter Perkins > Dept. Geology and Geological Engineering > University of North Dakota > Grand Forks ND 58202 > (701)777-2991o; (701)757-0579h > dexter.perkins@engr.und.edu