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[ahr-vid-suh-nahyt] /ˈɑr vɪd səˌnaɪt/
noun, Mineralogy
a sodium-rich amphibole, occurring in green to black crystals in alkalic rocks.
1830-40; named after J. A. Arfvedson (died 1841), Swedish chemist; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for arfvedsonite

amphibole mineral, an iron-rich sodium silicate. Lithium and magnesium replace iron in the structure to form eckermannite. Both minerals characteristically occur as dark-green crystals in alkali igneous rocks and their associated pegmatites. For chemical formula and detailed physical properties, see amphibole (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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