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Diabase - Dictionary Definition and Overview |
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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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