riebeckite

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riebeckite

(rē`bĕkīt'): see amphiboleamphibole
, any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements.
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riebeckite

[′rē‚be‚kīt]
(mineralogy)
Na2(Fe,Mg)5Si8O22(OH)2 A blue or black monoclinic amphibole occurring as a primary constituent in some acid- or sodium-rich igneous rocks.
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