单词 | piedmontite |
释义 | Word Frequency piedmontite or piemontite (ˈpiːdmɒnˌtaɪt, -mən-) noun 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 |
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