Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.362.9-3.5
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Conchoidal
Cleavage
[110] perfect, [101] good, [010] distinct
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
3.5-45.5-6
2
10
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Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)