Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.54-2.784.95-5.0
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
Good in three directions
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5-64-5
2
10
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Chemical Composition
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references