1. Plural of amphibolite; metamorphic rocks composed primarily of amphibole minerals and plagioclase feldspar, typically formed from the metamorphism of igneous or sedimentary rocks.
Usage: geology; technical

Examples

• The geologist identified amphibolites in the mountain range, indicating high-grade metamorphic conditions.
• Amphibolites are commonly found in Archean basement complexes.
• The dark mineral composition of amphibolites makes them easily recognizable in the field.
• These amphibolites formed when original igneous rocks underwent intense heat and pressure.
• The study of amphibolites helps geologists understand the thermal history of ancient continental crust.