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plural pyroxenes
(mineralogy) Any of a group of crystalline minerals containing silicates of iron, magnesium and calcium. quotations examples
By the pathside, there are occasional large boulders that shown black crystals the size of a fingernail; these are pyroxene minerals that had time to crystallise out deep within the chamber of liquid rock – or magma – beneath the volcano.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 10