Pyrolusite
[pahy-ruh-loo-sahyt, pahy-rol-yuh-sahyt] /ˌpaɪ rəˈlu saɪt, paɪˈrɒl yəˌsaɪt/
noun
1.
a common mineral, manganese dioxide, MnO 2 , the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.
/ˌpaɪrəʊˈluːsaɪt/
noun
1.
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
n.
“manganese dioxide,” 1828, the name given in Roman times, when it was used, in a heated state, to de-colorize glass, from Greek elements pyro- “by heat, by fire” (see pyro-) + lysis “a loosening” (see lose).
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