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
1.8 Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009)
ConchoidalArthur Thomas, Gemstones (2009)
1.9 Cleavage
1.10 Mohs Hardness
1.12 Chemical Composition
Pb 26Ag 10Cu 24Cl 62(OH) 48 · 3H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Tourmaline is a series of several different minerals with unique chemical formulas.