Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.903.03-3.18
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Irregular, Conchoidal
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
{???} Indistinct
Mohs Hardness
47-7.5
2
10
👆🏻
Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)