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0 item @ $0.00  

Cronstedtite

#BM49998

Cronstedtite

#BM49998
Availability
Sold
Size
2.5 x 2 x 1.5 cm - Thumbnail 
Formula
(Fe2+,Fe3+)3(Si,Fe3+)2O5(OH)4 (RRUFF)
Locality
Siglo Viente mine, Llallagua, Bolivia

Brilliant, lustrous trigonal crystals of in prisms and discoidal crystals.

Cronstedtite

Formula
(Fe2+,Fe3+)3(Si,Fe3+)2O5(OH)4 
Crystal System
Trigonal 
Crystal Habit
Pyramidal, Divergent, Amorphous 
Cleavage
Perfect, None, None 
Luster
Vitreous - Resinous 
Color
brownish black, greenish black, dark brown, black 
Streak
dark olive green 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
3.5 

Data courtesy of Webmineral.

Collection
Bill McConlogue Collection

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