Aphanite
/ˈæf.əˌnaɪt/ noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 Certain dark igneous rocks having grain so fine that the individual crystals cannot be seen with the naked eye. countable, uncountable
- 2 fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye wordnet
Etymology
From Ancient Greek ἀφανής (aphanḗs, “indistinct, unseen, obscure”) + -ite.