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glaucophane(glô`kəfān'): 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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Na2Mg3 Al2Si8 A blue to black monoclinic sodium amphibole; blue to black coloration with marked pleochroism.