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Formula: AlWO3(OH)3
Wolframate, forms pseudomorphs
after scheelite crystals.
Crystal System: Triclinic
Specific gravity: 4.78 to 4.87 measured, 4.84 calculated
Hardness: 1
Streak: White
Colour: White (when free of iron)
Luminescence:
Solubility: Slowly attacked by hydrochloric and nitric acids, readily soluble in strong KOH solution
Environments
Metamorphic environments
Placer deposits
Localities
At the Kara No. 1 Pit, Kara Mines, Hampshire mining district, Burnie City, Tasmania, Australia, the first occurrence of
mpororoite and anthoinite outside the African Continent has been
found in an altered skarn, forming a white powdery mixture of the two
minerals pseudomorphing
scheelite. The thermal treatment of the mixture at 100oC for 6
hours in air brings about the conversion of mpororoite into
anthoinite, which re-hydrates into mpororoite, although the
associated anthoinite does not. The source of aluminium is ascribed
to the decomposition of aluminian andradite in the
skarn
(MM 48.397-400).
At the Flo property (Kalzas property), Mayo mining district, Yukon, Canada,
At the type locality, Mt Misobo Mine, Maniema, DR Congo, anthoinite occurs as powdery to chalky masses, as
pseudomorphs after large
scheelite crystals and as platy crystals to a few mm in size. It occurs in
tin-tungsten placers and in
tungsten-bearing quartz veins.
Associated minerals include cassiterite,
ferberite, quartz,
scheelite and wolframite
(Mindat).
Anthoinite from Mt Misobo Mine -
Image
At the Gifurwe Mines, Gifurwe, Rusarabuge, Burera District, Northern Province, Rwanda, anthoinite is associated
with raspite, ferberite and
ferritungstite
(HOM).
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