Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.102.90-2.98
1
7.18
👆🏻
Fracture
Splintery, Granular
Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
6-6.57.5-8
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references