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Formula: Ca3(U6+0.5Zr1.5)(Fe3+O4)3
Oxide, bitikleite group,
garnet supergroup, uranium-
and zirconium- bearing mineral
Crystal System: Isometric
Specific gravity: 4.801 calculated for the empirical formula
Streak: Brown
Colour: Dark brown to black
RADIOACTIVE and nearly completely metamict
Environments
Volcanic igneous environments
Metamorphic environments
Localities
At the type Locality, Xenolith no. 1, Lakargi Mountain, Upper Chegem volcanic caldera, Baksan Valley,
Kabardino-Balkaria, Russia, elbrusite-(Zr), a new
uranian garnet within the complex
solid solution elbrusite - kimzeyite -
toturite was discovered in spurrite
zones in skarn xenoliths. Associated minerals are
spurrite, rondorfite,
wadalite, kimzeyite,
perovskite, lakargiite,
hydroxylellestadite,
hillebrandite, afwillite,
hydrocalumite,
ettringite group minerals and
hydrogrossular. Elbrusite-(Zr) forms grains up to 15 µm in size.
It often occurs as zones and spots within Fe3+-dominant kimzeyite
crystals up to 30 µm in size
(AM 95.8.1172-1181).
Elbrusite from the Lakargi Mountain - Image
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