Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.51-2.632.98-3.10
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Perfect
{100} Perfect, {110} Good, {011} Distinct
Mohs Hardness
45.5-6
2
10
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Chemical Composition
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references