Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.842.9-3.5
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
{0001} good, {10 1 0} parting
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
7.5-85.5-6
2
10
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Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)