1. Plural of pyrolusite; a mineral form of manganese dioxide (MnO₂), typically black or dark gray, used as an ore of manganese and in various industrial applications.
Usage: technical; mineralogy

Examples

• Pyrolusites are commonly found in oxidized manganese ore deposits.
• The mining company extracted pyrolusites from the ore body for manganese production.
• Pyrolusites have a metallic luster and are used in the manufacture of dry cells.
• Geologists identified pyrolusites in the rock samples collected from the site.
• Industrial applications of pyrolusites include use as a catalyst and in glass production.