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Tubulite Geocronite & Polybasite

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SER915962

Tubulite Geocronite & Polybasite

Description Tabs

Description
Locality: 
Borgofranco Mines, Biò, Borgofranco d'Ivrea, Canavese, Torino Province, Piedmont, Italy
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.2 × 1 cm
Description

rounded needles of tubulite crystals with grey needles of boulangerite and an hexagonal crystal group  of probabily polybasite

Mineral Data
What's on the rock

Tubulite

Formula: 
Ag2Pb22Sb20S53
Strunz: 
2.JB.35f
Hardness: 
0.0
Colour: 
Black
Type Locality: 
Rivet Quarry, Montredon-Labessonnié, Réalmont, Tarn, Midi-Pyrénées, France

Geocronite

Formula: 
Pb14(Sb,As)6S23
Strunz: 
2.JB.30a
Hardness: 
2.5 - 3.0
Type Locality: 
Sala Silver Mine, Sala, Västmanland, Sweden

Polybasite

Formula: 
[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Strunz: 
2.GB.15
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.5 - 3.0
Streak: 
black