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Mineralpedia Details for Gaudefroyite

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Gaudefroyite

Gaudefroyite

Named to honor Abbe Christophe Gaudefroy, a French mineralogist who worked in Morocco where the mineral gets its type locality at the Tachgagalt mine. Additional localities for Gaudefroyite include at the N’Chwaning I, II, and III mines and the Wessels and Black Rock mines in the Northern Cape Province of South Africa. It occurs as an uncommon hydrothermal mineral in manganese deposits.

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

Formula
Ca4Mn3+3(BO3)3(CO3)(O,OH)3 
Crystal System
Hexagonal 
Crystal Habit
Prismatic 
Cleavage
None, None, None 
Luster
Adamantine - Resinous 
Color
black 
Streak
brown 
Class
Hexagonal - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
WebMineral
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Gaudefroyite from N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa

Gaudefroyite
            from N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa

Long prismatic, jet balck crystals to 1cm.

Deep red fine, micro Andradite garnet crystals with slender, prismatic crystals of Gaudefroyite to 9mm.

Terminated 1cm crystals.

Click thumbnail images for larger view.

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