Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.652.52-2.60
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
3,1
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
75.5-6
2
10
👆🏻
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references