Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.442.60-2.64
1
7.18
👆🏻
Fracture
-
Uneven, Splintery, Conchoidal
Cleavage
None Observed
Absent
Mohs Hardness
6.5-76.5-7
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2Arthur Thomas , Gemstones (2009)