Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.102.65
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{100} Perfect, {110} Good, {011} Distinct
3,1
Mohs Hardness
5.5-67
2
10
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Chemical Composition
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references
SiO 2Ulrich Henn and Claudio C.