psephite

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English

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English Wikipedia has an article on:
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Etymology

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From Ancient Greek ψῆφος (psêphos, pebble) +‎ -ite.

Noun

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psephite (countable and uncountable, plural psephites)

  1. A sediment or sedimentary rock composed of fragments that are coarser than sand and which are enclosed in a matrix that varies in kind and amount.