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Formula: NaNbO3
Oxide, perovskite subgroup, isometric
paramorph of orthorhombic lueshite,
monoclinic natroniobite and trigonal
pauloabibite, niobium-bearing
mineral
Crystal System: Isometric
Specific gravity: 4.72 measured, 4.69 calculated
Hardness: 5½
Streak: Pale yellow
Colour: Brownish black
Weakly RADIOACTIVE
Environments
Pegmatites
Hydrothermal environments
Isolueshite is a rare mineral that to date (September 2021) has been found only at the type locality.
Localities
At the type locality, the Kirovskii apatite mine, Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia,
isolueshite occurs in a hydrothermally-altered pegmatite
vein in urtite-ijolite.
Perhaps a quenched polymorph of
lueshite, formed by rapid crystallisation after a sudden drop in temperature
and/or pressure.
Associated minerals include microcline,
sodalite, aegirine,
arfvedsonite and
lamprophyllite
(HOM).
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