a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
Origin of aphanite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
Word Origin for aphanite
C19: from Greek aphanēs invisible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012