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Mineralpedia Details for Talmessite

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Talmessite

Talmessite

Named for its type locality and first noted locality at the Talmessi Mine in the Esfahan Province of Iran. This rare mineral occurs at just a handful of localities as a secondary mineral in the oxidized zone of hydrothermal mineral deposits as an alteration product of realgar, orpiment or copper-nickel arsenides.

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

Formula
Ca2Mg(AsO4)2ยท2H2
Crystal System
Triclinic 
Luster
Vitreous (Glassy) 
Color
colorless, white, light green 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
WebMineral
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Mindat
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Talmessite from Bou Azzer dist., Anti-Atlas, Morocco

Talmessite
            from Bou Azzer dist., Anti-Atlas, Morocco

Pink crystals to 3mm of cobaltoan Talmessite.

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