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

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Other Words from aphanite

aphanitic \¦afə¦nitik \ adjective
aphanitism \ˈafəˌnītˌizəm; əˈfanəˌtiz-​, aˈ-​ \ noun plural -s

History and Etymology for aphanite

French, from aphan- + -ite

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