Aphanitic
a fine-grained igneous rock having such compact texture that the const-tuent minerals cannot be detected with the naked eye.
noun
any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
aphanitic
(āf’ə-nĭt’ĭk)
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. compare phaneritic.
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