piedmontite


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piedmontite

(ˈpiːdmɒnˌtaɪt; -mən-) or

piemontite

n
(Minerals) a dark red mineral occurring in metamorphic rocks: a complex hydrated silicate containing calcium, aluminium, iron, and manganese. Formula: Ca2(Al,Fe,Mn)3(SiO4)3OH
[C19: from Piedmont in Italy]
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