Mineralpedia Details for 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
- 6
- WebMineral
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- Mindat
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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.
