General Information:
Chemical Formula:
(Sr,La,Ce,Ca)4(Fe++,Fe+++)(Ti+++,Zr)3Si4O12O10
Physical Properties:
Color:
brownish black or gray.
Density:
5.44
Diaphaniety:
Opaque
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Sub Metallic
Streak:
brown
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