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Franckeite

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CR848110

Franckeite

Rare Mineral

Description Tabs

Description
Locality: 
San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 3.5 × 3 cm
Description

This is one of the rarest sulphosalts in the world.

The specimen is a very rich, rare, superb quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulphosalt franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates forming the shape of a flower on massive franckeite.

SEM-EDS confirmed specimen.

Mineral Data
What's on the rock

Franckeite

Formula: 
Fe2+(Pb,Sn2+)6Sn4+2Sb2S14
Strunz: 
2.HF.25b
Hardness: 
2.5 - 3.0
Type Locality: 
Chocaya mine, Chocaya-Animas (Animas-Chocaya), Atocha-Quechisla District, Sud Chichas Province, Potosí Department, Bolivia