amphibole

Etymology

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

noun

  1. (mineralogy) Any of a large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium/aluminum
    Remember when we could see the mountain's peak? The sparkle off the amphibole. 2017, Jason Isbell, Cumberland Gap

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