- a fine-grained gabbro occurring as minor intrusions.
- British. a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.
Origin of diabase
Examples from the Web for diabase
Historical Examples of diabase
Quartz porphyry, diabase and diorite appear in the Ardennes.
The minerals of diabase are the same as those of dolerite, viz.
One, a complete specimen composed of a diabase, was shaped by pecking followed by grinding.The Topanga Culture Final Report on Excavations, 1948
A. E. Treganza
In Arizona chrysotile is found in veins in cherty limestone, associated with diabase intrusives.The Economic Aspect of Geology
C. K. Leith
At St Andreasberg in the Harz it occurs both in diabase and in the veins of silver ore.
- British an altered dolerite
- US another name for dolerite
Word Origin for diabase
- 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