Diabase meaning

dī'ə-bās'
A dark-gray to black, fine-textured igneous rock composed mainly of feldspar and pyroxene and used for monuments and as crushed stone.
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A finely crystalline, intrusive basaltic rock made up mainly of labradorite and pyroxene.
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Altered dolerite.
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A dark-gray to black, medium-grained igneous rock consisting mainly of labradorite and pyroxene. Diabase is compositionally similar to andesite, but has coarser grains. It is commonly found in sills and dikes.
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(geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar.
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Origin of diabase

  • French partly from Greek diabasis a crossing over (from diabainein to pass through or over diabetes) and partly from diabase (dia- two) (alteration of di-) (from Greek di- di–1) (base basis) (from Old French base1)
    From American Heritage Dictionary of the English Language, 5th Edition