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 ?
Although FLUX B and FLUX A + MgO bring theoretically the same total amount of MgO in the slags A-2 and B, the faster dissolution of MgO in Calcium Magnesium Aluminate Flux creates an advantage over an external MgO addition.
It has also been tested how a reduced addition rate of Calcium Magnesium Aluminate Flux behaves.
We succeeded in the production of magnesium aluminate spinel nanoparticles, that are among the most important fireproof engineering ceramics, in a few minutes through microwave radiation instead of the conventional method that usually took place at 1000 AC in two hours," she added.
Blocks treated with the other oxy-aluminum compounds were less dimensionally stable than those treated with magnesium aluminate, possibly because of the lower weight gains achieved with these treatments (Table 3).
5 and 6), with the exception of magnesium aluminate.