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Franciscanite

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SMM657554

Franciscanite

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Description
Locality: 
Gambatesa Mine, Reppia, Genova, Liguria, Italy
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.5 × 0.5 cm
Description

Very dark, red/black, crystalline spot of the rare mineral franciscanite, it was only found in three locations in the world.

Boxed with Label
Mineral Data
What's on the rock

Franciscanite

Formula: 
Mn2+6(V5+,☐)2(SiO4)2(O,OH)6
Strunz: 
9.AF.75
Hardness: 
4.0
Type Locality: 
Pennsylvania Mine, San Antonio Valley, Mount Hamilton, Black Wonder District, Diablo Range, Santa Clara Co., California, USA

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