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Mineralpedia Details for Geminite

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Geminite

Geminite

Named after the Latin word gemini, meaning “twins,” as the mineral is often extensively twinned. Localities for Geminite include in France, the Czech Republic, Germany, as well as newer localities in Morocco, and Namibia. This rare mineral occurs in oxidized arsenic-bearing lead-copper deposits at its type locality at Cap Garonne in France, and from mine dumps at a gold-bearing arsenic sulfide deposit at Salisigne, also in France.

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

Formula
Cu2+(AsO3OH)·H2
Crystal System
Triclinic 
Crystal Habit
Radial, Columnar, Twinning Common 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
light green, sea green 
Streak
pale green 
Class
Triclinic 
Fracture
Irregular 
Hardness
3-3.5 
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Geminite from Jachymov, Erzgegirge, Bohemia, Czech Republic

Geminite
            from Jachymov, Erzgegirge, Bohemia, Czech Republic

Light green, variscite green, micro crystalline aggregates in botyoidal forms, with white Arsenolite.

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