1. A metamorphic rock composed primarily of amphibole minerals, typically formed from the metamorphism of igneous or sedimentary rocks.
Usage: geology; technical

Examples

• The geologist identified the dark rock sample as amphibolite based on its mineral composition.
• Amphibolite formations are common in high-grade metamorphic terranes.
• The amphibolite contained visible crystals of hornblende and plagioclase feldspar.
• This mountain range exhibits extensive amphibolite outcrops from ancient tectonic activity.
• The amphibolite facies represents metamorphic conditions at moderate to high temperatures and pressures.