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Garnet

Property Specification
Chemical Formula General formula: X₃Y₂(SiO₄)₃
Crystal System Isometric (Cubic)
Hardness (Mohs) 6.5 – 7.5
Specific Gravity 3.1 – 4.3
Cleavage None
Fracture Conchoidal to uneven
Luster Vitreous to resinous
Transparency Transparent to opaque
Refractive Index 1.72 – 1.94
Color Red, orange, yellow, green, purple, brown, black (depending on type)
Streak White
Tenacity Brittle
Crystal Habit Dodecahedral or trapezohedral crystals
Pleochroism None
Birefringence None (Isotropic)