1. a dark-colored igneous rock composed mainly of plagioclase feldspar and pyroxene, formed from cooled magma
Usage: geological

Examples

• The ancient monument was carved from local dolerite stone.
• Geologists identified dolerite intrusions in the sedimentary layers.
• The dark dolerite contrasted sharply with the surrounding limestone.
• Road construction crews quarried dolerite for use as aggregate.
• The dolerite sill formed when magma cooled slowly underground.
• Students examined thin sections of dolerite under the microscope.