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Mineralpedia Details for Pyroaurite

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Pyroaurite

Pyroaurite

Named after the golden yellow color it develops upon exposure to hear, Pyroaurite is named for the Greek pyr, meaning “fire,” and aurum, meaning “gold.” Few localities worldwide including Sweden, Italy, Austria, Scotland, Russia, Japan, Canada, the USA, and South Africa, among others. Pyroaurite occurs as an authigenic weathering product and in hydrothermal veins, serpentinite, and ophiolite.

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

Formula
Mg6Fe3+2CO3(OH)16·4H2
Crystal System
Trigonal 
Crystal Habit
Tabular, Fibrous 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brownish yellow, brown white, colorless, greenish, yellowish white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Flexible 
Hardness
2.5 
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Pyroaurite from Långban, Filipstad, Värmland, Sweden

Pyroaurite
            from Långban, Filipstad, Värmland, Sweden

Golden yellow platy crystals to 1mm.

Click thumbnail images for larger view.

Pyroaurite from Irhtem, Bou Azzer district, Morocco

Pyroaurite
            from Irhtem, Bou Azzer district, Morocco

Very thin clear to yellowish, hexagonal plates of Pyroaurite well protected in a Dolomite vug.

Click thumbnail images for larger view.

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