Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.29-3.333.80-4.15
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
Perfect
perfect along [010] and [100]
Mohs Hardness
53.5-4
2
10
👆🏻
Chemical Composition
(Ca,Ce) 4 Na(Na,Ca) 2 Ti(Si 2 O 7 ) 2 F 2 (O,F) 2 Michael O’Donoghue, Gems, Sixth Edition (2006)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references