Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.08-2.162.90-2.98
1
7.18
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Fracture
Irregular/uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
distinct/good on {1011}
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
4.57.5-8
2
10
👆🏻
Chemical Composition
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references