Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.783.26-3.36
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{???} Distinct, {???} Indistinct
Good on {100}
Mohs Hardness
5-66.5-7
2
10
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Chemical Composition
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references