odinite

Century Dictionary and Cyclopedia

1. n. In petrography, an aphanitic porphyry, with few small phenocrysts of labradorite and augite in a ground-mass of feldspar prisms and needles of hornblende.

Wiktionary

1. n. mineralogy A monoclinic-domatic mineral containing aluminum, hydrogen, iron, magnesium, manganese, oxygen, silicon, and titanium.