Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.355-3.4335.9-6.3
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
{???} Good, {???} Good
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
-99994.5-5
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references