Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.314.95-5.0
1
7.18
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Fracture
-
Uneven
Cleavage
Indiscernible
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
-99994-5
2
10
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Chemical Composition
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references