Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.52-2.603.16-3.43
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
{0001} Imperfect, {1120} Imperfect
{110} Good, {110} Good
Mohs Hardness
5.5-65-6
2
10
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Chemical Composition
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)