spinel

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spinel,

magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous rocks, in aluminum-rich metamorphic rocks, and in contact-metamorphosed limestones. Common spinel usually ranges in color from dark green to brown or black, but transparent red, blue, and green varieties are found and are used as gemstones; Myanmar and Sri Lanka are the principal producing countries. Much gem-quality spinel is now produced synthetically.

spinel

[spə′nel]
(mineralogy)
MgAl2O4 A colorless, purplish-red, greenish, yellow, or black mineral, usually forming octahedral crystals, and characterized by great hardness; used as a gemstone.
A group of minerals of general formula AB2O4, where A is magnesium, ferrous iron, zinc, or manganese, or a combination of them, and B is aluminum, ferric iron, or chromium.
References in periodicals archive ?
04, the samples have the monophase cubic spinel structure while for y [greater than or equal to]0.
The lattice parameter of the as-prepared sample, according to the cubic crystal structure was calculated from the main peak of spinel structure (311) using equation:
In addition to mixed oxide nanocatalysts with spinel structure, the nanocatalysts used in this research can be used in various environmental applications such as controlling the gaseous pollutants emitted from chemical and petrochemical industries and the exhaust of the automobiles.
The cubic spinel structure has 3 unique atoms and 1 variable coordinate, while the Pmca-constrained subcell has 16 atoms and 23 variable coordinates (and the "true" Cc structure has an asymmetric unit that is four times larger).