General Information:
Chemical Formula:
(U,Fe,Y,Ca)(Nb,Ta)O4 (?)
Environment:
In pegmatites.
Locality:
Ishikawa, Ivaki Province, Japan.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
None
Color:
black.
Density:
6.2 - 6.4, Average = 6.3
Diaphaniety:
Opaque
Habits:
Metamict - Mineral originally crystalline, now amorphous due to radiation damage., ,
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Resinous
Streak:
dark brown
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