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Mineralpedia Details for Perroudite

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Perroudite

Perroudite

Named in honor of Professor Pierre Perroud of Voltaire College in Geneva, Switzerland who worked extensively on Cap Garonne mine minerals where Perroudite gets its type locality.  At Cap Garonne, Perroudite occurs as an alteration mineral of tennantite in sandstone and conglomerate, and occurs elsewhere in quartz veins that bear oxidized galena. Perroudite can be found additionally in Germany, and Australia, among a couple other localities.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/perroudite.pdf

Formula
Ag4Hg5S5(I,Br)2Cl2 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Aggregates, Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Adamantine 
Color
light red 
Streak
orange red 
Class
Orthorhombic - Disphenoidal 
Fracture
Brittle - Irregular 
Hardness
WebMineral
View Perroudite 
Mindat
View Perroudite 

Perroudite from Capitana mine, Ladrillos dist., Copiapo Province, Atacama, Chile

Perroudite
            from Capitana mine, Ladrillos dist., Copiapo Province, Atacama, Chile

Tiny, less than 0.75mm, vugs filled with acicular buches of bright red Perroudite in spongy Chrysocolla matrix.

Click thumbnail images for larger view.

Perroudite from Broken Hill, New South Wales, Australia

Perroudite
            from Broken Hill, New South Wales, Australia

Deep brick red noncrystalline patches and inclusions which oxide to a black color. 

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Perroudite from Coppin Pool, Ashburton Shire, Western Australia, Australia

Perroudite
            from Coppin Pool, Ashburton Shire, Western Australia, Australia

Very rich specimen with micro red needles throughout the vugs.

Click thumbnail images for larger view.

Perroudite from Cap Garonne mine, Le Pradet, Var, France

Perroudite
            from Cap Garonne mine, Le Pradet, Var, France
Special Info
Type Locality

Small specimen with at least four tiny vugs showing bright red acicular crystals. The shiny red needle in the photo is a good example.

Click thumbnail images for larger view.

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