Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.95-2.962.9-3.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
7-7.55.5-6
2
10
👆🏻
Chemical Composition
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)