Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.78-9999
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Good in three directions
None
Mohs Hardness
5-63-4
2
10
👆🏻
Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite