| aphanite | <chemical> A very compact, dark-coloured ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains. Origin: Gr. Invisible; priv. + to appear. Source: Websters Dictionary (01 Mar 1998) |
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| aphanite | fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye |
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