By A Mystery Man Writer
Just bought this one in New York today, the tag just says it's called roscoelite and is a mix of mica and vanadium. Can anyone give me more info on it?
Vanadinite - Wikipedia
Category:Coloma, California - Wikimedia Commons
Caulinita - Wikiwand
Rocks ppt download
Category:Mica - Wikimedia Commons
Ore - Wikipedia
Category:Minerals, Geology Wiki
Placerville Colorado – Western Mining History
List of minerals recognized by the International Mineralogical Association (R) - Wikipedia
List of minerals - Wikiwand