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 ?
Whereas the exhibition catalogue devoted a full two pages to the history of Victoria's great diamond, the Timur went unnamed as part of a "short necklace, of four very large spinelle rubies" (4:919).
That it affords no essential characters is evident because different species, such as diamond and spinelle, have the same integral mollecule; and other minerals, such as zeolite, that unquestionably belong to the same species, have different integral mollecules.
Anhelamos este ano poder incrementar el 35 % a nivel publicitario y servirles cada vez mas a nuestros dientes", explica Mike Spinelle, gerente general de Warner Channel Latin America.