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Polybasite

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SER1076297

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Description
Locality: 
La Luz, Guanajuato Municipality, Guanajuato, Mexico
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 3.1 × 2.6 cm
Description

several groups of grey lustrous metallic polybasite crystals on matrix

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

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