MELAPHYRE

Etymology

Noun

melaphyre (countable and uncountable, plural melaphyres)

(obsolete) Various dark-coloured volcanic igneous rocks rich in augite, similar to and in some definitions including basalt, principally of Paleozoic age

Source: Wiktionary

Mel"a*phyre, n. Etym: [F., fr. Gr. phyre porphyry.] (Min.)

Definition: Any one of several dark-colored augitic, eruptive rocks allied to basalt.

Source: Webster’s Unabridged Dictionary 1913 Edition