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Formula: (Y,U,Fe2+)(Ta,Nb)(O,OH)4
Multiple oxide, samarskite group
Crystal System: Orthorhombic
Specific gravity: 5.5 to 5.9 measured
Hardness: 5 to 5½
Streak: Brown, grey
Colour: Black
Common impurities: Nb
RADIOACTIVE
Environments
Yttrotantalite-(Y) is a rare accessory mineral in granite
pegmatites, usually metamict
(Webmin, HOM).
Localities
At the Hattevik Feldspar Quarry, Dillingøya, Moss, and near Berg, Råde, both at Østfold, Norway,
yttrotantalite-(Y) is associated with monazite,
columbite, allanite,
samarskite, xenotime,
gadolinite and mica
(HOM).
AT the type locality, Ytterby, Resarö, Vaxholm, Stockholm County, Sweden, yttrotantalite-(Y) is associated with
albite, garnet,
topaz, and fergusonite-(Y)
(HOM, Dana).
At Finnbo and Broddbo, both at Falun, Dalarna County, Sweden, yttrotantalite-(Y) is associated with
albite, garnet and
topaz
(Dana).
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