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Nigeria
Property | Specification |
Chemical Formula | Mn₃Al₂(SiO₄)₃ (Manganese Aluminum Garnet) |
Crystal System | Isometric (Cubic) |
Hardness (Mohs) | 6.5 – 7.5 |
Specific Gravity | 4.12 – 4.32 |
Cleavage | None |
Fracture | Conchoidal to uneven |
Luster | Vitreous |
Transparency | Transparent to translucent |
Refractive Index | 1.790 – 1.820 |
Color | Orange, reddish-orange, brownish-orange |
Streak | White |
Tenacity | Brittle |
Crystal Habit | Dodecahedral or trapezohedral crystals |
Pleochroism | None |
Birefringence | None (Isotropic) |
Dispersion | 0.027 |