Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.60-2.65
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal
Cleavage
Perfect
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5-6.56-6.5
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)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)