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plural ignimbrites
(geology) A deposit left by the pyroclastic flow from a volcano, consisting of ash, pumice lapilli, and lithic fragments. quotations
The walls of the houses and shops and temples were often constructed of alternating courses of large blocks of ignimbrite and small, sienna-coloured Roman bricks.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 13