Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.793.87-4.14
1
7.18
👆🏻
Fracture
Irregular/uneven
Subconchoidal, Conchoidal
Cleavage
Perfect on {10bar10}
Poor on {120}, in traces on {001}
Mohs Hardness
2.55.5-6
2
10
👆🏻
Chemical Composition
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references