Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.43-3.44
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
-
Cleavage
Absent
None Observed
Mohs Hardness
6.5-76.5-7
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references