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spinel

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spi⋅nel

  [spi-nel, spin-l]
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–noun
1. any of a group of minerals composed principally of oxides of magnesium, aluminum, iron, manganese, chromium, etc., characterized by their hardness and octahedral crystals.
2. a mineral of this group, essentially magnesium aluminate, MgAl2O4, some varieties being used as gems.
Also, spi⋅nelle.

Origin:
1520–30; < F spinelle < It spinella, equiv. to spin(a) thorn (< L spīna) + -ella -elle
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Spinel Jewelry and Gems
Selection and savings up to 80% off our entire stock of Spinel Stones.
www.Jtv.com
Quality Spinel Gemstones
Top Burma Spinels in All Colors All Gems in Stock, Ship Immediately
www.gemselect.com
spi·nel also spi·nelle   (spĭ-něl')   
n.  

  1. A hard, variously colored mineral with composition MgAl2O4, having usually octahedral crystals and occurring in igneous and carbonate rocks. The red variety is valued as a gem and 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.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
spinel also spinelle   (spĭ-něl')  Pronunciation Key 

  1. 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.

  2. Any of a group of minerals that are oxides of magnesium, iron, zinc, manganese, or aluminum.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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