Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.102.45
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{100} Perfect, {110} Good, {011} Distinct
Perfect on {001}, good on {110}
Mohs Hardness
5.5-64-4.5
2
10
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Chemical Composition
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)