from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A monoclinic-domatic mineral containing aluminum, hydrogen, iron, magnesium, manganese, oxygen, silicon, and titanium.
from The Century Dictionary and Cyclopedia
- 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.
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