Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.97-3.143.87-4.14
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Subconchoidal, Conchoidal
Cleavage
{1011} Indistinct
Poor on {120}, in traces on {001}
Mohs Hardness
-99995.5-6
2
10
👆🏻
Chemical Composition
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references