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WordReference Random House Unabridged Dictionary of American English © 2024am•phi•bole (am′fə bōl′),USA pronunciation n. [Mineral.]- Mineralogyany of a complex group of hydrous silicate minerals, containing chiefly calcium, magnesium, sodium, iron, and aluminum, and including hornblende, tremolite, asbestos, etc., occurring as important constituents of many rocks.
- Late Latin amphibolus amphibolous
- French
- 1600–10
Collins Concise English Dictionary © HarperCollins Publishers:: amphibole /ˈæmfɪˌbəʊl/ n - any of a large group of minerals consisting of the silicates of calcium, iron, magnesium, sodium, and aluminium, usually in the form of long slender dark-coloured crystals. Members of the group, including hornblende, actinolite, and tremolite, are common constituents of igneous rocks
Etymology: 17th Century: from French, from Greek amphibolos uncertain; so called from the large number of varieties in the group |