Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.90-4.002.60-3.02
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Perfect on {001}, good on {210}, poor on {010}
Perfect
Mohs Hardness
3-3.5-9999
2
10
👆🏻
Chemical Composition
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)