Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.97-3.032.6-3.3
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Lamellar
Cleavage
{001} Poor
Perfect 001
Mohs Hardness
72-2.5
2
10
👆🏻
Chemical Composition
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6