EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
Diabase is a basaltic rock which is comparatively coarse grained. Dolerite is a synonym for diabase. Diabase is made up of the essential minerals of basalt, olivine, augite and plagioclase feldspar. The chemical and microscopic features of diabase is almost identical to basalts.
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