Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.97-3.145.00-5.30
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{1011} Indistinct
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
-99996
2
10
👆🏻
Chemical Composition
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Fe 2O 3Arthur Thomas , Gemstones (2009)