aphanite Meaning, Definition & Usage
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noun fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
WordNet
Aph"a*nite noun
Etymology
Gr. invisible; priv. + to appear.Definitions
(Min.) A very compact, dark-colored ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains.