SINCE 1828
roscoelite
noun
ros·coe·lite
| \ ˈrä(ˌ)skōˌlīt\
plural -s
Definition of roscoelite
: a mineral approximately K2(Mg,Fe,V,Al)4(Si,Al)8O20(OH)4 consisting of a brownish mica in minute scales that contains vanadium
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