Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.95-2.963.90-4.00
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
7-7.53-3.5
2
10
👆🏻
Chemical Composition
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references