Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.20-2.262.45
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Perfect on {110}
Perfect on {001}, good on {110}
Mohs Hardness
5-5.54-4.5
2
10
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Chemical Composition
Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)