Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.97-3.145.00-5.20
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
{1011} Indistinct
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
-99996-6.5
2
10
👆🏻
Chemical Composition
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references