Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.03-3.186.46-6.57
1
7.18
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Fracture
Uneven, Irregular, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{???} Indistinct
Good [110] and [021]
Mohs Hardness
7-7.53-3.5
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references