Mineralpedia Details for Riebeckite
Riebeckite
- Formula
- [box]Na2(Fe2+3Fe3+2)Si8O22(OH)2
- Crystal System
- Monoclinic
- Crystal Habit
- Striated, Fibrous, Massive - Fibrous
- Cleavage
- Perfect, Perfect, None
- Luster
- Vitreous - Silky
- Color
- blue, black, dark green
- Streak
- greenish brown
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle - Uneven
- Hardness
- 4
- WebMineral
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Riebeckite from Kuruman, Kalahari Mn fields, Northern Cape Province, South Africa
Blue-gray fibrous Riebeckite occurs in three bands on this sample, with the largest being around a centimeter at its widest.
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