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Formula: (U,Fe,Y)NbO4
Multiple oxide, samarskite group,
columbite supergroup
Crystal System: Monoclinic
Specific gravity: 6.2 to 6.4 measures
Hardness: 5 to 6
Streak: Dark brown, black
Colour: Black
RADIOACTIVE
Common impurities: Ca,Ce,Ta,Ti,Sn,Si,Th,Mn,Mg,REE
Environments
Ishikawaite occurs in granite
pegmatites; it is sometimes coated by brown to red brown surface
alterations, and is partially
or completely be metamict. Common associates include annite,
microcline, monazite-(Ce) and
quartz
(Mindat).
Localities
At the type locality, Ishikawa District, Fukushima Prefecture, Japan, Ishikawaite occurs in an
NYF-pegmatite. Associated minerals include
samarskite-(Y), quartz and
columbite-(Fe)
(Mindat, HOM).
Ishikawaite from Ishikawa - Image
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