Gem, Rock, and Mineral Postage Stamps Featuring
Proustite


Mineral Name: Proustite

Composition: Silver arsenic sulfide

Nomenclature: Named after J.L. Proust, a French chemist.

Industrial Uses: Silver ore.

Additional Notes: Also referred to as ruby silver ore and light red silver ore.



Germany, DDR : Scott 798 : 20 pfennige : 11 Nov 1965

Proustite



Germany, DDR : Scott 1359 : 50 pfennige : 22 Feb 1972

Proustite