Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.67-2.732.9-3.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
35.5-6
2
10
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Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)