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  • ...ock with an aphanitic texture, i.e. a relatively fine-grained (<1 mm) rock in which the individual crystals cannot be distinguished with the naked eye an ...volcanics and shallow hypabyssal rocks are not always treated as distinct. In the context of Precambrian shield geology, the term "volcanic" is often app
    19 KB (2,870 words) - 23:23, 15 May 2020