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 : 65 cents : 2 Jan 1991
Boltwoodite