Melaphyre

noun

1. A dark igneous porphyry embedded with feldspar crystals.
2. A fine-grained greenish- or brownish-black aggregate of plagioclase, augite, olivin, magnetite, or titaniferous iron and some chloritic mineral, usually delessite.
3. It is proposed, in the field classification accompanying the quantitative system of classification of igneous rocks (see rock), to restore the term melaphyre to its early significance and apply it to all dark-colored porphyries, of any composition.
4. Any one of several dark-colored augitic, eruptive rocks allied to basalt.
5. Any of several dark augitic eruptive rocks allied to basalt.