Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.05-3.082.36
1
7.18
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Fracture
Uneven, Irregular, Conchoidal
Uneven, Subconchoidal, Fibrous
Cleavage
None
[110] perfect, [101] good, [010] distinct
Mohs Hardness
6.53.5-4
2
10
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Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references