Tenacity
Brittle
Brittle
Solubility
-
Readily soluble in HF
Durability
-
-
Specific Gravity
5.50-5.902.86-2.94
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
None observed
Mohs Hardness
46.5-7
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references