| 单词 | pyrolusite |
| 释义 | Word Frequency pyrolusite(ˌpaɪrəʊˈluːsaɪt) noun a blackish fibrous or soft powdery mineral consisting of manganese dioxide in tetragonal crystalline form. It occurs in association with other manganese ores and is an important source of manganese. Formula: MnO2 Word origin C19: from pyro- + Greek lousis a washing +-ite1, from its use in purifying glass |
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