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Spessartite

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