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also spi·nelle  (spĭ-nĕl′)
1. A hard, variously colored mineral with composition MgAl2O4, having usually octahedral crystals, occurring in igneous and metamorphosed carbonate rocks, and valued as a gem. The red variety is sometimes confused with ruby.
2. Any of a group of minerals that are oxides of magnesium, iron, zinc, manganese, or aluminum.

[Italian spinella, diminutive of spina, thorn (from its sharply pointed crystals), from Latin spīna.]


1. (Minerals) any of a group of hard glassy minerals of variable colour consisting of oxides of aluminium, magnesium, chromium, iron, zinc, or manganese and occurring in the form of octahedral crystals: used as gemstones
2. (Minerals) a hard, glassy mineral composed of magnesium-aluminium oxide found in metamorphosed limestones and many basic and ultrabasic igneous rocks. Formula: MgAl2O4
[C16: from French spinelle, from Italian spinella, diminutive of spina a thorn, from Latin; so called from the shape of the crystals]


or spi•nelle

(spɪˈnɛl, ˈspɪn l)

1. any of a group of minerals composed of oxides of metals (magnesium, aluminum, iron, zinc, manganese, etc.).
2. a mineral of this group, magnesium aluminum oxide, MgAl2O4, having octahedral crystals: some varieties are used as gems.
[1520–30; < French spinelle < Italian spinella <spin(a) thorn]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.spinel - a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones
atomic number 12, magnesium, Mg - a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
ruby spinel, spinel ruby - a spinel used as a gemstone (usually dark red)
Ceylonite, pleonaste - a dark-colored spinel containing iron
References in periodicals archive ?
Magnesium aluminate (Mg[Al.sub.2][O.sub.4]), spinel is the only intermediate compound in the phase diagram of the system MgO-[Al.sub.2][O.sub.3] [1].
Summary: TEHRAN (FNA)- Iranian researchers at the Islamic Azad University announced that they have synthesized Magnesium aluminate spinel nanoparticles to produce fireproof ceramics.
The composites are referred to according to the oxy-aluminum compound deposited in the wood: sodium aluminate, aluminum hydroxide, magnesium aluminate, and aluminum borate.
The superplastic ceramic, made up 40% of zirconium oxide, 30% magnesium aluminate spinel and 30% alpha alumina, does not harden, and can be stretched over 1,050%.
When the chromic content in chromitite is 10% or less, the rock is a chrome-rich variety of common spinel (magnesium aluminate) called picotite.
While a variety of buffer materials has been identified, the first system the NEC researchers used was a combination of barium titanate ([BaTiO.sub.3]) and magnesium aluminate ([MgAl.sub.2.O.sub.4]).
Mehran Rezaei, a member of academic staff at Kashan University is the researcher who has synthesized nanocrystalline magnesium aluminates to better nickel catalyst used in methane reforming process.In this research, first magnesium aluminate was prepared through precipitation method in presence of surface active agents.