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Mineralpedia Details for Stichtite

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Stichtite

Stichtite

Formula
Mg6Cr2CO3(OH)16ยท4H2
Crystal System
Trigonal 
Crystal Habit
Encrustations, Nodular, Micaceous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
lilac, light violet, pink 
Streak
pale violet blue 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
1.5-2 
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Stichtite from Barberton dist., Mpumalanga prov., South Africa

Stichtite
            from Barberton dist., Mpumalanga prov., South Africa

The specimen is interesting mineralogically as well as petrologically. I have not studied how the Chrysotile veinlets are formed, certainly through the process of serpetinization, which involves low temperature regional metamorphism of mafic rocks low in silica. In this case chromium was present. I assume it is an old specimen indicated by the old inked number of which there is an old label.

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Stichtite from Dunite quarry, Greenhills, South Island, New Zealand

Stichtite
            from Dunite quarry, Greenhills, South Island, New Zealand

Deep purple fibrous crystals in veins to 1cm. Rich

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