Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.9-3.52.75
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Imperfect on {110}
Mohs Hardness
5.5-65.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.