Isolueshite

isolueshite

aegirine

arfvedsonite

lamprophyllite

Images

Formula: NaNbO3
Oxide, perovskite group, isometric paramorph of orthorhombic lueshite, monoclinic natroniobite and trigonal pauloabibite, niobium-bearing mineral
Specific gravity: 4.72
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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