amphibole

[am-fuh-bohl]
noun Mineralogy.
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.

Origin:
1600–10; < French < Late Latin amphibolus amphibolous

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World English Dictionary
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
 
[C17: from French, from Greek amphibolos uncertain; so called from the large number of varieties in the group]

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American Heritage
Science Dictionary
amphibole   (ām'fə-bōl')  Pronunciation Key 
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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Example sentences
Blue amphibole contains sodium and, of course, is bluish in color more details.
Some studies show that amphibole fibers stay in the lungs longer than chrysotile.
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