General Information:
Chemical Formula:
(Ce,La,Ca,Na,Th)4(Fe++,Mg2((Ti,Fe+++)3Si4O22
Environment:
Secondary mineral in titanium and cerium bearing rocks.
IMA Status:
Approved IMA 1987
Locality:
Miask in the Ilmen Mountains, Russia.
Physical Properties:
Cleavage:
None
Color:
brownish black or dark red.
Density:
4.5
Diaphaniety:
Translucent to subtranslucent to opaque
Habits:
Acicular - Occurs as needle-like crystals., Massive - Uniformly indistinguishable crystals forming large masses., Amorphous - No crystalline form or imitative shape.
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Earthy (Dull)
Streak:
black
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