Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.72
1
7.18
👆🏻
Fracture
-
-
Cleavage
Perfect
{110} Perfect, {010} Perfect
Mohs Hardness
5-6.55-6
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)
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)