Carnotite

hydrated potassium uranium vanadate
K₂(UO₂)₂[VO₄]·3H₂O

Carnotite on Rhyolite
Cerro Colorado, New Mexico
Collected on 18 Mar 2004

Closeup of Carnotite Crystals
Cerro Colorado, New Mexico
Collected on 18 Mar 2004