aphanite

noun

aph·a·nite | \ ˈafəˌnīt, usually -t + V\

plural -s

Definition of aphanite

: a dark rock of such close texture that its separate grains are invisible to the naked eye

aphanitic \ ¦afə¦nitik \ adjective

aphanitism \ ˈafəˌnītˌizəm ; əˈfanəˌtiz- , aˈ- \ noun, plural -s

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