Mineralogy and Crystallography

A Dictionary of Earth Sciences The Columbia Encyclopedia, 6th ed. Further reading

riebeckite

A Dictionary of Earth Sciences | 1999 | | Copyright

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

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

riebeckite : see amphibole .

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"riebeckite." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-riebecki.html

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