Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.793.05-3.21
1
7.18
👆🏻
Fracture
Irregular/uneven
Uneven, Subconchoidal, Splintery
Cleavage
Perfect on {10bar10}
Good on {110}, poor on {100}
Mohs Hardness
2.57.5
2
10
👆🏻
Chemical Composition
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references