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aphanitic

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
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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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.
Pan American Gold Corporation Announces New Breccia-hosted ... by Business Wire
The vein follows a North 60 West trending structure that is up to 50 meters wide and together with a dark gray, aphanitic trachyte porphyry dike cuts fractured, sheared, and hornfelthized andesite and diorite wall rocks.
Pan American Receives Preliminary Drill Results from Huicicila ... by Business Wire
Breccia fragments consist of grey sandstone or shale, minor fragments of aphanitic dacite with minor pyrite, and veinlets of quartz.
Bonanza-Grade Silver Assays Reported at Solaga by Business Wire
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