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(mineralogy) A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals. / (geology) Any light-colored volcanic rock whose true mineralogy is not yet determined.

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felsite

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felsite

noun

(mineralogy) A fine grained volcanic extrusive rock, generally light in color, composed of felsic minerals. / (geology) Any light-colored volcanic rock whose true mineralogy is not yet determined.