Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.52-2.602.65
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
{0001} Imperfect, {1120} Imperfect
3,1
Mohs Hardness
5.5-67
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
SiO 2Ulrich Henn and Claudio C.