Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.95-5.02.59-2.60
1
7.18
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Fracture
Uneven
-
Cleavage
Imperfect to indistinct on {10 1 0}, parting on {0001}
{001} Perfect, {110} Distinct, {101} Distinct
Mohs Hardness
4-56-7
2
10
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Chemical Composition
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)