amphibole

Definition

Any of a large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium.

Etymology

From French amphibole, coined by René Just Haüy from Ancient Greek ἀμφίβολος (amphíbolos, “ambiguous”), in reference to its many forms.

Example Sentences

• "Remember when we could see the mountain's peak? The sparkle off the amphibole."