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aphanite

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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.
aphanite [ˈæfəˌnaɪt]
n
(Earth Sciences / Geological Science) any fine-grained rock, such as a basalt, containing minerals that cannot be distinguished with the naked eye
[from Greek aphanēs invisible]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.aphanite - fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries"
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In hand specimen, leached, oxidized, and sheared San Diego breccia consists of cobble to boulder sized, sub-rounded aphanite clasts in a dark gray, amorphous silica matrix.
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Prospect pits and minor workings mark the Huichapa vein zone and its accompanying aphanite porphyry dike for approximately 1500 meters on surface.
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