APHANITE

aphanite

(noun) fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye

Source: WordNet® 3.1

Etymology

Noun

aphanite (plural aphanites)

(geology) Certain dark igneous rocks having grain so fine that the individual crystals cannot be seen with the naked eye.

Source: Wiktionary

Aph"a*nite, n. Etym: [Gr. (Min.)

Definition: A very compact, dark-colored

Source: Webster’s Unabridged Dictionary 1913 Edition

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