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Formula: (Fe3+,Ta)(Nb,Ti)O4
Oxide, wolframite group,
tantalum-,
niobium- and titanium- bearing
mineral
Crystal System: Monoclinic
Specific gravity: 6.06 measured, 6.302 calculated
Hardness: 6
Streak: Black
Colour: Black
Environments
Rossovskyite is a relatively new mineral, approved in 2014.
Localities
At the type locality, the Bulgut pegmatite, Bulgan District, Bayan-Ölgii Province, Mongolia, rossovskyite was
found in a lens-shaped zoned granite
pegmatite at the contact of
porphyraceous biotite
granite with crystalline
schist. The flattened anhedral grains of rossovskyite up to
6 × 6 × 2 cm3 are present along the contact between smoky to pink
quartz of the core and the
microcline zone with large
muscovite crystals up to 70 cm across,
triplite blocks up to 30 cm, albite,
apatite, pyrite,
schorl,
almandine–spessartine
garnet, beryl,
zircon, pyrite,
oxyyttrobetafite-(Y) and tantalo-niobates. Smaller (1–1.5 cm)
single-crystal grains of rossovskyite occur in adjacent parts of the
microcline zone. Rossovskyite was formed as one of the latest
minerals at the autometasomatic albitisation stage.
Apatite, oxyyttrobetafite-(Y),
later generations of muscovite and
schorl crystallised after rossovskyite.
Oxyyttrobetafite-(Y) forms veinlets in rossovskyite grains
(AM 102.2531).
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