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Pyrargyrite & Polybasite

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PDM579501

Pyrargyrite & Polybasite

Description Tabs

Description
Locality: 
Guanajuato, Mexico
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 1.7 × 1.6 cm
Largest Crystal: 
0.40cm
Description

Lustrous, deep red pyrargyrite crystals to 4 mm with good terminations, on a matrix of tabular metallic grey crystals of Polybasite, golden yellow chalcopyrite, and white quartz and calcite. There are broken crystals on one side but the main ones at the top are very aerial and in good condition.

It is an Ex. Lucien Jusgen (BE) specimen and according to his register book it was bought at the Brussels Mineral Show on March 19th 1981. There is no detailed information about the mine, just “Guanajuato, Mexique”.

Mineral Data
What's on the rock

Pyrargyrite

Formula: 
Ag3SbS3
Strunz: 
2.GA.05
Crystal System: 
Trigonal - Ditrigonal Pyramidal
Hardness: 
2.5

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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