spinel(redirected from Spinels)
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spi·nelalso 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]
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|Noun||1.||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