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Formula: Y(W,Fe,Si,Al,Ti)2(O,OH,H2O)9
Hydrated tungstate
Crystal System: Monoclinic
Specific gravity: 5.96 measured, 5.98 calculated
Hardness: 1
Streak: Yellow-white
Colour: Canary yellow, light yellow.
Mildly RADIOACTIVE
Environments
Yttrotungstite-(Y) occurs in eluvial cassiterite mines, probably altered
from wolframite or scheelite.
Associated minerals include kaolinite, quartz,
muscovite, hydrobiotite,
hematite, cassiterite,
tourmaline, scheelite,
rutile, stolzite,
raspite, plagioclase and
gypsum
(HOM).
Localities
At the type locality, the Kramat Pulai mine, Kramat Pulai, Kinta District, Perak, Malaysia, yttrotungstite-(Y) is
associated with tourmaline, scheelite,
rutile, stolzite,
raspite, quartz,
muscovite, kaolinite,
hydrobiotite,
hematite, gypsum,
cassiterite and
albite-anorthite
(Mindat, Dana).
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