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aphanite

[af-uh-nahyt] /ˈæf əˌnaɪt/
noun, Petrography
1.
a fine-grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye.
Origin
1860-1865
1860-65; < Greek aphan(ḗs) unseen, hidden, invisible (a- a-6 + phanēs, adj. derivative of phaínein to bring to light, disclose) + -ite1
Related forms
aphanitic
[af-uh-nit-ik] /ˌæf əˈnɪt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for aphanitic

aphanite

/ˈæfəˌnaɪt/
noun
1.
any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
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
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aphanitic in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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