Enstatite

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Chemical composition -- A complex family of iron and magnesium silicates.

Color -- Usually green, brown, or yellow.

Optics -- R.I. 1.65-1.77 (usually 1.65-1.68).

Durability -- Hardness 5-6.

Crystal structure -- Orthorhombic.

Specific Gravity -- 3.2-4.0.

Sources -- Blackish green four-ray star enstatite cabochons from India and Sri Lanka are plentiful and inexpensive. They are often used as cheap (and much softer) substitutes for black star sapphires.

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