Tenacity
-
Very brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.19-3.563.30-3.40
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{110} Perfect, {010} Indistinct
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
5.5-66.5-7
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references