1 Physical Properties
1.1 Tenacity
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1.2 Solubility
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1.3 Durability
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1.4 Specific Gravity
2.5 Fracture
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
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2.6 Cleavage
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2.7 Mohs Hardness
2.13 Chemical Composition
SiO 2Walter Schumann , Gemstones of the world (2001)
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