noun Petrology.

  1. a fine-grained gabbro occurring as minor intrusions.
  2. British. a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.


  1. British an altered dolerite
  2. US another name for dolerite

  1. 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. Also called dolerite

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