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What is an aphanite?

What is an aphanite? Here are some definitions.

Noun
  1. (geology) Certain dark igneous rocks having grain so fine that the individual crystals cannot be seen with the naked eye.
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Examples
Prospect pits and minor workings mark the Huichapa vein zone and its accompanying aphanite porphyry dike for approximately 1500 meters on surface.
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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