Carnotite

Carnotite – K2(UO2)2(VO4)2·3H2O
Class: Vanadates
Crystal System: Monoclinic
Hardness: 2
Gypsum
Talc (1)Diamond (10)
Soft. A fingernail can scratch it.
Origin: Egnar, San Miguel, Colorado – Usa
Did you know?

The bright yellow carnotite of the American West was mined first for radium, then for the uranium behind the atomic age.