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aphanite

[af-uh-nahyt]
noun Petrography.
  1. a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
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Origin of aphanite

1860–65; < Greek aphan(ḗs) unseen, hidden, invisible (a- a-6 + phanēs, adj. derivative of phaínein to bring to light, disclose) + -ite1
Related formsaph·a·nit·ic [af-uh-nit-ik] /ˌæf əˈnɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aphanite

aphanite

noun
  1. any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
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Word Origin

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