noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Metamorphic rock composed mostly of amphibole, plagioclase, with lesser amounts of epidote, zoisite, chlorite, quartz, titanite, and accessory leucoxene, ilmenite and magnetite derived from an igneous rock.

Etymology

From ortho- + amphibolite.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.