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Franciscanite & Rankachite

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SHS134498

Franciscanite & Rankachite

Description Tabs

Description
Locality: 
Pennsylvania Mine, Sugarloaf Mountain, Santa Clara County, California, United States of America
Size Range: 
Micromount (under 1cm)
Size: 
0.7 × 0.6 × 0.6 cm
Description

Franciscanite and rankachite on matrix

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

Rankachite

Formula: 
Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH)·2H2O
Strunz: 
7.GB.25
Crystal System: 
Orthorhombic
Hardness: 
2.5
Type Locality: 
Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany