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.
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.
noun the free-swimming larva of certain sponges, which consists of a hollow spherical mass of cells some of which have flagella Historical Examples During the later periods of the amphiblastula stage a cavity appears in the granular cells dividing them into two layers. The Works of Francis Maitland Balfour, Volume II (of 4) Francis Maitland […]
equivocal; uncertain; changing; ambiguous.
ambiguity of speech, especially from uncertainty of the grammatical construction rather than of the meaning of the words, as in The Duke yet lives that Henry shall depose. Historical Examples The phrase transcendental object occurs once in the second Analogy and twice in the Note on amphiboly. A Commentary to Kant’s ‘Critique of Pure Reason’ […]
- Amphibolic fistula
amphibolic fistula amphibolic fistula am·phi·bol·ic fistula (ām’fə-bŏl’ĭk) or am·phib·o·lous fistula (ām-fĭb’ə-ləs) n. A complete anal fistula opening both externally and internally.