amphibole
noun
- mineral group; double chain inosilicates
Wiktionary
Pronunciation: /ˈæm.fɪˌboʊl/
noun
Etymology: From French amphibole, coined by René Just Haüy from Ancient Greek ἀμφίβολος (amphíbolos, “ambiguous”), in reference to its many forms.
- Any of a large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium.
“Remember when we could see the mountain's peak? The sparkle off the amphibole.”