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(mineralogy) Any of several hard minerals of cubic symmetry that are mixed oxides of magnesium and aluminium and are used as gemstones of various colours.

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spinel

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spinel

/spɪˈnɛl/

noun

The spinel is a rare gemstone that comes in a variety of colors.

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意味（1）

Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)

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(solid state chemistry) Any crystalline material, not necessarily an oxide, that possesses the same crystal structure as this mineral.

意味（3）

Bleached yarn in making the linen tape called inkle; unwrought inkle.

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spinel

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