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1. Oxford American Dictionary

   pyrolusite

   • IPA[ˌpīrəˈlo͞oˌsīt]

   美式

   • n.
     a black or dark gray mineral with a metallic luster, consisting of manganese dioxide.

   • noun: pyrolusite

2. • 更多解釋

   pyrolusite

   • IPA[ˌpʌɪrəˈluːsʌɪt]

   英式

   • n.
     a black or dark grey mineral with a metallic lustre, consisting of manganese dioxide.

   Oxford Dictionary