Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.54-2.61
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect
{001} Perfect, {010} Good
Mohs Hardness
5-6.56
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)