Chert

[tʃә:t]

解释:

(noun.) variety of silica containing microcrystalline quartz.

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解释:

(n.) An impure, massive, flintlike quartz or hornstone, of a dull color.

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解释:

n. a kind of quartz or flint: hornstone.—adj. Chert′y like or containing chert.

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