aphanite

Etymology

From Ancient Greek ἀφανής (aphanḗs, “indistinct, unseen, obscure”).

Noun

aphanite (plural aphanites)

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

Further reading

• aphanite in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• aphanite in The Century Dictionary, The Century Co., New York, 1911
• aphanite at OneLook Dictionary Search