Tiger's eye
Gemstone
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Tiger's eye is a
chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre. Wikipedia
Luster: Silky
Hardness (Mohs hardness scale): ≥ 7
Category: Mineral
Formula (repeating unit): Silica (silicon dioxide, SiO2)
Mohs scale hardness: 6.5-7
Specific gravity: 2.64–2.71