Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.03-3.182.55-2.63
1
7.18
👆🏻
Fracture
Uneven, Irregular, Conchoidal
Uneven
Cleavage
{???} Indistinct
{001} Perfect, {010} Good
Mohs Hardness
7-7.56-6.5
2
10
👆🏻
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
KAlSi 3O 8Arthur Thomas , Gemstones (2009)