硬锰矿（Psilomelane）化学成分mMnO·MnO2·nH2O，含Mn45%～60%。斜方晶系。通常呈钟乳状、肾状、葡萄状集合体，亦有呈树枝状、致密块状集合体。颜色与条痕均为黑色。半金属光泽。硬度4～6。比重4.4～4.7。性脆。常见于锰矿床的氧化带和沉积锰矿床中。是炼锰的重要矿物原料。
锰结核主要由硬锰矿、 软锰矿、 褐铁矿构成。
The mineral components of nodules are mainly pyrolusite, psilomelane and limonite.
主要载银矿物有硬锰矿、软锰矿、褐铁矿、方铅矿、黄铁矿和闪锌矿。
The main silver-bearing minerals were psilomelane, pyrolusite, limonite, galena, pyrite and sphalerite.
矿石矿物主要有硬锰矿、软锰矿、褐锰矿、菱锰矿、钙菱锰矿等。脉石矿物主要有磁铁矿、针铁矿、黄铁矿等。
Ore minerals are composed of psilomelane, pyrolusite, braunite, rhodochrosite and manganocalcite and gangue minerals are composed of magnetite, goethite and pyrite and so on.
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