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a. A vesicular, glassy to finely crystalline material produced by fusion
or partial fusion of target rock by the heat generated from the impact of
a large meteorite, and occurring in and around the resulting crater,
typically as individual bodies composed of mixtures of melt and rock
fragments, often with traces of meteoritic material; a rock from a
presumed impact site. Syn: impact slag; impact glass. AGI
b. A term used incorrectly for any shock-metamorphosed rock. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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