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Formula: CaAl4O7
Multiple oxide
Crystal System: Monoclinic
Specific gravity: 2.88 calculated
Streak: White
Colour: White to colourless
Luminescence: Not fluorescent under UV
Common impurities: Fe
Environments
Metamorphic environments
Meteorites
Grossite occurs in calcium-aluminium-rich inclusions of meteorites thought to be formed by condensation from a hot
gas or molten droplets
(Mindat)
Localities
There are two co-type localities, the Acfer 182 meteorite, Foggaret Ezzaouia, In Salah District, In Salah Province,
Algeria, and the Hatrurim Formation, Middle East.
At the Acfer 182 meteorite, Foggaret Ezzaouia, In Salah District, In Salah Province, Algeria, grossite occurs in
calcium-aluminium-rich inclusions of meteorites thought to be formed by condensation from a hot gas or molten droplets.
Associated minerals include perovskite,
melilite, hibonite,
spinel and high-calcium pyroxene
(HOM).
At the Hatrurim Formation, Middle East, grossite occurs in argillaceous
limestone metamorphosed at high temperature and low pressure. Associated
minerals include brownmillerite,
mayenite and larnite
(HOM).
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