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piedmontite

/ˈpiːdmɒnˌtaɪt; -mən-/
noun
1.
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
Word Origin
C19: from Piedmont in Italy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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