Spessartite

Spessartite (or spessartine) garnet is an orange to reddish-brown variety of the gemstone garnet.

• Mohs hardness: 6.5-7.5

• Color: Yellow, yellow-orange, orange, orange-red, red, reddish-brown, brown

• Crystal structure: cubic

• Luster: Vitreous (glassy), resinous, or sub-adamantine

• Transparency: Transparent to opaque

• Refractive index: 1.79-1.985

• Specific Gravity: 3.80-4.25

• Cleavage: None

• Fracture: Conchoidal or subconchoidal

• Streak: White

• Luminescence: None

• Pleochroism: None

• Birefringence: None

• Dispersion: 0.027 (moderate)

• Optical effects: Color-change, chatoyancy

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