Tenacity
Brittle
Brittle
Solubility
Readily soluble in HF
-
Durability
-
-
Specific Gravity
2.86-2.946.50-7.00
1
7.18
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Fracture
Conchoidal, Uneven
Irregular, Conchoidal
Cleavage
None observed
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
6.5-73
2
10
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Chemical Composition
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
PbMoO 4Walter Schumann , Gemstones of the world (2001)