A finely crystalline, intrusive basaltic rock made up mainly of labradorite and pyroxene.
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.
French partly from Greek diabasisa crossing over (fromdiabaineinto pass through or overdiabetes) and partly fromdiabase (dia-two) (alteration ofdi-) (from Greek di-di–1) (basebasis) (from Old French base1)
American Heritage Dictionary of the English Language, 5th Edition
Diabase Sentence Examples
Along Hudson Bay shore there is a strip of similar rocks, and a long row of small islands of the same age, with great sheets of trap or diabase forming the tops of the hills.
All the volcanic rocks of these islands are submarine stratified tuffs which are penetrated here and there by andesite or diabase dikes.
These are modified forms of basic rocks such as basalt, dolerite and diabase.
The Pretoria Series, formerly known as the Gatsrand series, consists of repeated alternations of flagstones and quartzites, shales and sheets of diabase.