Tenacity
-
Brittle
Solubility
-
Readily soluble in HF
Durability
-
-
Specific Gravity
2.9-3.52.86-2.94
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
None observed
Mohs Hardness
5.5-66.5-7
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references