Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.60-3.61-9999
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Imperfect/fair/absent
None
Mohs Hardness
8-8.53-4
2
10
👆🏻
Chemical Composition
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite