1 Physical Properties
2.1 Tenacity
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2.3 Solubility
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2.5 Durability
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2.7 Specific Gravity
2.9 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Handbook of mineralogy (2001)
2.11 Cleavage
2.13 Mohs Hardness
2.15 Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)