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 ?
The XRD analysis also proved the presence of spinels in the form of Nichromite and Chromite along with the major oxides.
The researchers from Argonne provided significant experimental confirmation of the magnesium scandium selenide spinel material.
X-ray diffraction patterns of all the powder samples assured the existence of cubic spinel structure.
The fabrication of spinel ferrites nanoparticles has been the subject of intense research interest due to their excellent magnetic, electrical and dielectric properties [2].
Spinel is the magnesium aluminium member of the larger spinel group of minerals.
ArmorLine, a South Carolina-based company part of the Defense Venture Group, has developed an optical grade transparent spinel ceramic that allows to produce transparent armour with a considerable weight saving.
The haul included a yellow gold ring with three diamonds, a yellow gold men''s wedding band with a white centre band and a diamond cut milled edge, a white and yellow gold eternity ring set with white synthetic spinel stones, a pair of emerald and diamond round cluster stud earrings and a yellow gold link bracelet.
Spinels are also used as a basis for the conceptual development and application of crystal field theory, particularly, through the calculation of site preference energies in determination of inverse or normal spinel structures which has also been demonstrated through the use of ping-pong ball models to aid the understanding of structure development [2, 3].
Summary: TEHRAN (FNA)- Iranian researchers from Tabriz and Mazandaran universities made a breakthrough in eliminating volatile organic compounds that pollute the air by producing manganite nanocatalysts with spinel structure.
Kenneth and Constance Moore marked their blue spinel anniversary on April 5.
I think spinel has gotten a bum rap because synthetic colourless spinel was historically being used as a diamond simulant.