The name amphibole (Greek αμφιβολος amphibolos meaning 'ambiguous') was used by René Just Haüy to include tremolite, actinolite, tourmaline, and hornblende. The group was so named by Haüy in allusion to the protean variety, in composition and appearance, assumed by its minerals. This term has since been applied to the whole group.
Amphiboles are found in the corundumbearing rock, locally in association with extremely Alpoor orthopyroxene (LowAl OPX). In this paper, petrological and geochemical studies revealed that amphiboles and LowAl OPX in the studied samples were formed by infiltration of aqueous fluids in the late stage of exhumation of the Horoman Complex.