Aphanitic meaning

ăfə-nĭtĭk
Of or relating to an igneous rock in which the crystals are so fine that individual minerals cannot be distinguished with the naked eye. Aphanitic rocks are extrusive rocks that cooled so quickly that crystal growth was inhibited.
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(geology) Pertaining to or consisting of aphanites, igneous rocks which have crystals too fine to be seen by the naked eye.
adjective
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Origin of aphanitic