Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.90-4.003.355-3.433
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Perfect on {001}, good on {210}, poor on {010}
{???} Good, {???} Good
Mohs Hardness
3-3.5-9999
2
10
👆🏻
Chemical Composition
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)