glaucophane
noun
glau·co·phane
ˈglȯkəˌfān
plural -s
: a mineral Na2(Mg,Fe)3Al2Si8O22(OH)2 consisting of a blue, bluish black, or grayish silicate of sodium, aluminum, iron, and magnesium occurring in certain crystalline schists
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Merriam-Webster unabridged
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