Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.95-5.02.6-3.3
1
7.18
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Fracture
Uneven
Lamellar
Cleavage
Imperfect to indistinct on {10 1 0}, parting on {0001}
Perfect 001
Mohs Hardness
4-52-2.5
2
10
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Chemical Composition
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6