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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