Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.903.1-3.2
1
7.18
👆🏻
Fracture
Uneven, Splintery
-
Cleavage
Perfect on {100} and {001}
Vitreous, pearly on cleavage
Mohs Hardness
4.5-53-4
2
10
👆🏻
Chemical Composition
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references