aphanite

noun

aphanite

noun

/ˈæf.əˌnaɪt/

Etymology From Ancient Greek ἀφανής (aphanḗs, “indistinct, unseen, obscure”) + English -ite.

1

Geography, Geology, Natural sciences, Petrology Certain dark igneous rocks having grain so fine that the individual crystals cannot be seen with the naked eye.

Derived terms
aphanitic

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.