Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.03-3.182.60-2.64
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
Uneven, Splintery, Conchoidal
Cleavage
{???} Indistinct
Absent
Mohs Hardness
7-7.56.5-7
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
SiO 2Arthur Thomas , Gemstones (2009)