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
1.11 Fracture
Uneven, Uneven, Irregular, Management Team (2012), Conchoidal, Brittle
Uneven, UnevenArthur Thomas, Gemstones (2009)
1.12 Cleavage
1.13 Mohs Hardness
1.23 Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
Pb 26Ag 10Cu 24Cl 62(OH) 48 · 3H 2OWalter Schumann , Gemstones of the world (2001) More from other references