noun
- a dark-colored igneous rock composed mainly of plagioclase feldspar and pyroxene
Usage: geology
Examples
- The geologist identified the dark rock sample as diabase.
- Diabase forms when magma cools slowly beneath the Earth’s surface.
- The ancient lava flow contained large amounts of diabase.
- Students examined thin sections of diabase under the microscope.
- The quarry produced diabase for use in road construction.
- Diabase intrusions are common in this geological formation.