I am a collector of extraordinary and unusual 18th and 19th century scientific instruments. We are interested in purchasing goniometers, petrographic microscopes and any other interesting mineralogical research instruments for our collection. If you have a mineralogical instrument that you are interested in selling or know a potential seller of one please contact us. The following is a link to our website which will give you an idea of our varied collecting interests www.mm-instruments.com<http://www.mm-instruments.com/> Thank you Mark McElyea 3124 Del Oceano Dr. Lafayette, Ca. 94549 USA 925-935-5700 phone 925-935-6883 fax powcom@comcast.net<mailto:powcom@comcast.net>