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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
- 2
- WebMineral
- View Perroudite
- Mindat
- View Perroudite
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.
Perroudite from Broken Hill, New South Wales, Australia

Deep brick red noncrystalline patches and inclusions which oxide to a black color.
Perroudite from Coppin Pool, Ashburton Shire, Western Australia, Australia

Very rich specimen with micro red needles throughout the vugs.
Perroudite from Cap Garonne mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, 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.