Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.24-2.292.9-3.5
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal
Cleavage
Very poor [100]
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5-5.55.5-6
2
10
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Chemical Composition
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)