Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.13-3.26
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
None
Mohs Hardness
5.5-6-9999
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca 5(F,Cl)(PO 4) 3Arthur Thomas , Gemstones (2009)