Definition of spilite
: a very fine-grained to dense and greenish to gray-green extrusive rock of the gabbro family often vesicular or amygdaloid and generally free from phenocrysts that is composed essentially of the same minerals as diabase and shows an ophitic texture with augite grains between laths of basic plagioclase
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Origin and Etymology of spilite
French, from Greek spilos spot, stain + French -ite
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