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aphanitic

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aph·a·nite  (f-nt)
n.
A dense, homogeneous rock with constituents so fine that they cannot be seen by the naked eye.
[From Greek aphans, unseen : a-, not; see a-1 + phainesthai, phan-, to appear, passive of phainein, to show; see phenomenon.]
apha·nitic (-ntk) adj.
aphanitic  (f-ntk)
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.
ThesaurusLegend:  Synonyms Related Words Antonyms
Adj.1.aphanitic - of or relating to aphanite
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5-foot thick aphanitic layer of calcarenitic limestone, commonly marly and fossilifer-ous; (2) a 233-foot thick aphanitic limestone; and (3) a 110.
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San Diego Breccia At San Diego, silica flooding and hairline quartz veinlets obscure breccated aphanitic rock in four outcrops that protrude through shallow soil and elluvial cover over a 20 x 30 meter area.
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