any 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.
Historical Examples

Both are common alteration products of magnesian silicate minerals such as olivine, pyroxene, and amphibole.
The Economic Aspect of Geology C. K. Leith

Pargasite, pr′ga-sīt, n. a dark-green crystallised variety of amphibole or hornblende.
Chambers’s Twentieth Century Dictionary (part 3 of 4: N-R) Various

The fibrous variety of serpentine is the principal source of asbestos, an amphibole asbestos being less common.
Geology William J. Miller

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
Any of a large group of usually dark minerals composed of a silicate joined to various metals, such as magnesium, iron, calcium or sodium. Amphiboles occur as columnar or fibrous prismatic crystals in igneous and metamorphic rocks. Most are monoclinic, but some are orthorhombic. Hornblende, actinolite and glaucophane are amphiboles. Chemical formula: (Mg,Fe,Ca,Na)2-3(Mg,Fe,Al)5(Si,Al)8O22OH2.


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