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fortification agate

noun

  1. an agate, used as a gem, having polygonal banding such that it suggests the plan of a bastion.

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Word History and Origins

Origin of fortification agate1

First recorded in 1880–85

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Example Sentences

Sometimes they are arranged in angles, presenting the fortification-agate.

I found a piece of granite and a fragment of fortification agate in the sandy bed of the creek.

Some specimens have several distinct colours arranged in zigzag lines, somewhat resembling the fortification agate.

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