Formula: (U,Fe,Y,Ca)(Nb,Ta)O4
Origin of name: After locality; Ishikawa district, Fukushima Pref., Japan
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Resinous
Habit: Crystals tabular
Hardness: 5 to 6
Specific gravity: 6.2 to 6.4
Cleavage: None
Tenacity:
Streak: Dark brown
Synonyms/varieties:
Comments:
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