/ahr"vid seuh nuyt'/, n. Mineral.
a sodium-rich amphibole, occurring in green to black crystals in alkalic rocks.
[1830-40; named after J. A. Arfvedson (d. 1841), Swedish chemist; see -ITE1]

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      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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Universalium. 2010.

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