Tenacity
Elastic
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.13.18-3.22
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
Perfect basal {001}
{1011} Indistinct
Mohs Hardness
3.5-4.0-9999
2
10
👆🏻
Chemical Composition
-
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)