Gem, Rock, and Mineral Postage Stamps Featuring

Mineral Name: Boltwoodite
Composition: Hydrated potassium uranyl silicate hydroxide
Nomenclature: Named after the American chemist Bertram Borden Boltwood who, in 1907, developed the process of radioactive dating.
Industrial Uses: Uranium ore (minor), scientific study.
Additional Notes: Strongly radioactive.

Namibia Scott 685
Scott 685
65 cents
2 Jan 1991

The stamp shows a natural, unpolished mineral specimen
along with its name and chemical formula. Philatelic Mineralogy Copyright © 1997-2010 by Richard Busch