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JPG
A sample of Metahewettite (reddish brown) with gypsum (white) on sandstone from the Hummer Mine in Montrose County, Colorado, year unknown.
A sample of Metahewettite...  
JPG
Corvusite (blue black) with other vanadium-based minerals in sandstone and petrified wood (aka fossilized wood) from the La Salle Mining and Development Company at Club Mesa in Montrose County, Colora
Corvusite (blue black)...