[Chemical composition] Fine particles and cryptocrystalline blocks often contain mechanical inclusions such as Fe ₂ O ₃ and SiO ₂ and contain H ₂ O.

[Crystal structure] tetragonal system; a ₀ =0.439 nm, c ₀ =0.286 nm; Z=2. Rutile crystal structure belongs.

[Form] Complete crystals are rare, sometimes in the form of needle-like or radial aggregates (Fig. Y-15). Often in the form of kidneys, tuberculosis, massive or powdery aggregates.

FIG Y-15 of needle assembly soft manganese ore

[Physical properties] Black, the surface often has a light blue ochre; streaks black; semi-metallic luster to earthy luster. Cleavage parallel {110} is complete. The hardness varies depending on the thickness of the crystal, and the crystallinity can reach 6 and the cryptocrystalline block drops to 2. The relative density of the crystals is 4.7 to 5, and the bulk is reduced to 4.5. Crisp.

[genesis and production] are mainly formed in weathering and sedimentation. It is one of the main manganese minerals in the sedimentary genesis manganese deposit. A large number of pyrolusite deposits are found in sedimentary manganese deposits in Hunan, Guangxi, Liaoning, and Sichuan. The formation of large black pollution is called manganese cap.

[Identification features] With its black color, black streaks, and brittleness, crystallized ones have complete cylindrical cleavage, which is characterized by low hardness and easy dirt. In addition, the dropped H ₂ O _{2 was} vigorously foamed.

[Main use] is the main ore mineral of manganese.

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