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diabase |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Diabase \Di"a*base\, n. [F. diabase, fr Gr ? a crossing or passing over fr ?; ? + ? to go -- so called by Brongniart because it passes over to diorite.] (Min.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone.
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