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spinel

[spi-nel, spin-l]

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noun

any of a group of minerals composed principally of oxides of magnesium, aluminum, iron, manganese, chromium, etc., characterized by their hardness and octahedral crystals.

a mineral of this group, essentially magnesium aluminate, MgAl₂O₄, some varieties being used as gems.

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Also, spi·nelle.

Origin:
1520–30; < French spinelle < Italian spinella, equivalent to spin(a) thorn (< Latin spīna) + -ella -elle

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Spinel is always a great word to know.

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an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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Collins

World English Dictionary

spinel (spɪˈnɛl)

—n
1.	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.	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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Science Dictionary

spinel also spinelle (spĭ-něl') Pronunciation Key

A hard, variously colored cubic mineral, having usually octahedral crystals and occurring in igneous and metamorphosed carbonate rocks. The red variety is valued as a gem and is sometimes confused with the ruby. Chemical formula: MgAl₂O₄.
Any of a group of minerals that are oxides of magnesium, iron, zinc, manganese, or aluminum.

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