Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.19-3.563.25-3.50
1
7.18
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Fracture
Uneven, Conchoidal
Uneven
Cleavage
{110} Perfect, {010} Indistinct
Distinct
Mohs Hardness
5.5-6-9999
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.