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Formula: (Sb3+,Ca)2Ta2O6O
Oxide, microlite group,
pyrochlore supergroup,
antimony- and tantalum-
bearing mineral
Crystal System: Isometric
Specific gravity: 5.98 calculated
Hardness: 5½
Streak: White
Colour: Greenish white to white
Environments
Localities
At the Odd West pegmatite, Rush Lake, Lac-du-Bonnet area, Manitoba, Canada, oxystibiomicrolite is associated
with cassiterite
(HOM).
At the type locality, Varuträsk, Skellefteå, Västerbotten County, Sweden, oxystibiomicrolite is a very rare
mineral, replacing stibiotantalite, in the
lithium-rich albite unit of a
complex granite
pegmatite. Associated minerals include
stibiotantalite, antimony, allemontite,
lithiophilite, alkalic beryl,
cassiterite,
columbite-tantalite and
microlite
(HOM).
Oxystibiomicolite from Varuträsk -
Image
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