a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
- aph·a·nit·ic [af-uh-nit-ik], /ˌæf əˈnɪt ɪk/, adjective
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British Dictionary definitions for aphanite
any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
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