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riebeckite

[ree-be-kahyt] /ˈri bɛˌkaɪt/
noun
1.
an amphibolic mineral, silicate of sodium and iron, occurring usually in feldspathoid rocks.
Origin
1885-1890
1885-90; named after Emil Riebeck (died 1885), German explorer; see -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for riebeckite

a sodium-iron silicate mineral [Na2Fe2+3Fe3+2Si8O22(OH)2] in the amphibole family. It forms part of a solid-solution series that includes both magnesioriebeckite (formed when iron is replaced by magnesium) and glaucophane (formed when iron is replaced by magnesium and aluminum).

Learn more about riebeckite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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