1 Physical Properties
2.2 Tenacity
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2.4 Solubility
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2.6 Durability
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2.7 Specific Gravity
2.8 Fracture
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
Handbook of mineralogy (2001)
2.9 Cleavage
2.10 Mohs Hardness
2.16 Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)