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Meaning of spinel

spi•nel

Pronunciation: (spi-nel', spin'l), [key]
— n.
  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, MgAlO, some varieties being used as gems.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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