Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.95-5.03.31
1
7.18
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Fracture
Uneven
-
Cleavage
Imperfect to indistinct on {10 1 0}, parting on {0001}
Indiscernible
Mohs Hardness
4-5-9999
2
10
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Chemical Composition
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)