Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.002.9-3.5
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
None
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5-5.55.5-6
2
10
👆🏻
Chemical Composition
CaBSiO 4(OH)Michael 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)