Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.783.19-3.56
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Good in three directions
{110} Perfect, {010} Indistinct
Mohs Hardness
5-65.5-6
2
10
👆🏻
Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)