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Polybasite & Cobaltite In Dolomite

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FCM681589

Polybasite & Cobaltite In Dolomite

Classic Locality

Description Tabs

Description
Locality: 
Hellens-Eplett Mine, North Cobalt, Ontario, Canada
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 6.6 × 0.7 cm
Description

This is a nice old specimen from a classic Canadian mining area featuring cauliflower shaped silvery -grey cobaltite containing veins of polybasite on a pink dolomite/black shale matrix.  The piece is an unpolished slab and is good on both sides.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Polybasite

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

Cobaltite

Formula: 
CoAsS
Strunz: 
2.EB.25
Crystal System: 
Orthorhombic - Pyramidal
Hardness: 
5.5

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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