Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.803.1-3.2
1
7.18
👆🏻
Fracture
-
-
Cleavage
Perfect
Vitreous, pearly on cleavage
Mohs Hardness
5-6.53-4
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)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references