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aphanite

aph·a·nite [ áffə nt ]


noun 
Definition:
 
igneous rock: an igneous rock with mineral components that are too fine to be seen by the naked eye

[Early 19th century. < Greek aphanēs "unseen" < phan-, stem of phainein (see phenomenon)]

aph·a·nit·ic [ àffə níttik ] adjective
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