Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.442.54-2.78
1
7.18
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Fracture
-
Conchoidal
Cleavage
None Observed
Good in three directions
Mohs Hardness
6.5-75-6
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references