Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.95-5.03.34
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Imperfect to indistinct on {10 1 0}, parting on {0001}
None
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
(Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)