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riebeckite

riebeckite A member of the alkali amphiboles Na2(Fe2+ 3Fe3+2)[Si4O11]2(OH,F)2 and end-member of an isomorphous series with glaucophane Na2(Mg3Al2)[Si4O11]2 (OH,F)2; sp. gr. 3.43; hardness 5; forms either tiny prismatic crystals or large, poikilitic, subhedral, prismatic crystals; dark bluish-green or black; occurs in alkaline igneous rocks, especially granites, in association with aegirine. Fibrous riebeckite (called crocidolite or blue asbestos) is formed by metamorphism of massive ironstone deposits. When infiltrated with silica it constitutes the semi-precious cat's eye or tiger's eye.

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"riebeckite." A Dictionary of Earth Sciences. . Encyclopedia.com. 23 Nov. 2017 <http://www.encyclopedia.com>.

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"riebeckite." A Dictionary of Earth Sciences. . Retrieved November 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/riebeckite

riebeckite

riebeckite (rē´bĕkīt´): see amphibole.

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"riebeckite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 23 Nov. 2017 <http://www.encyclopedia.com>.

"riebeckite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (November 23, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/riebeckite

"riebeckite." The Columbia Encyclopedia, 6th ed.. . Retrieved November 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/riebeckite