Manganese is found naturally in many minerals, but only a small portion of what is truly valuable can be mined as manganese ore.The main pyrolusite, followed by hard manganese ore, manganese ore, other such as water ore.Both pyrolusite and pyrolusite are mixed minerals, and pyrolusite is usually found in siderite.
manganite
The MnO (OH) chemical composition of hydromanganese ore is as follows: MnO 40.0%, MnO2 49.4% and H2O 10.2%.It often contains SiO2, Fe2O3, and trace Al2O3,CaO and other mixtures.Hydromanganese ore is an important mineral raw material for extracting manganese.
Manganese in brown
Mn2O3 contains 69.9% manganese.Tetragonal crystal system, crystal is conical or pseudoctahedral crystal shape, usually dense block or granular aggregate, color brown to steel gray, stripe dark brown, fresh port is uneven, semi metallic luster, relative density 4.72-4.83, hardness of 6~6.5, with large hardness, stripe brown and other similar black manganese minerals.
Pyrolusite
The chemical composition is MnO2, containing up to 63.2% manganese, often containing a small amount of water and silicon dioxide, iron oxide and hard manganese ore.Crystals are usually columnar, but also acicular, fibrous, granular, etc.Hardness 1 ~ 2.5, specific gravity 4.7 ~ 4.8.Metallic luster or dull.The color can be iron black or light blue black.The stripes are black.Soft sex can contaminate fingers, opacity.
Hard manganese ore
The composition is aqueous manganese oxide.The molecular formula is RMnO ·1MnO · Mh2O.The manganese content is about 45 ~ 60%.It often contains iron, calcium, copper, silicon and other impurities.It is lumpy, grape-like, cystolatiform, dendritic or earthy aggregate with smooth surface.Hardness 5 ~ 6, specific gravity 3.7 ~ 4.7.Semi-metallic luster to dull.The color is dark gray to iron black.The streaks are light dark brown and opaque.Brittle, smooth fracture or shell - like.
Black manganese ore
Mn3O4 contains 65% ~ 72% manganese. It is usually granular and massive aggregate. It is black in color, reddish brown in streaks, with relative density of 4.7 ~ 4.9 and hardness of about 5. As an anhydrous mineral, it is the most abundant mineral in nature.
