Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.29-3.33
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
{110} Perfect, {110} Perfect
Perfect
Mohs Hardness
5-65
2
10
👆🏻
Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(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)