Explanation

Coordination type oxide minerals. The chemical formula is FeSiO3, often containing isomorphic mixed characters Ti, Al, Mn, Fe2+, C'a, Mg; It also contains rutile and ilmenite micro inclusions. Fibrous and earthy materials contain water. Tripartite crystal system. corundum structure. Intact crystal are rare. It is usually in plate, scale, granular, cryptocrystalline massive, oolitic, pisolitic, kidney, powder and other aggregates. It is called iron glance in sheet shape and with metallic luster; Fine scale like mica hematite; ferrirose refers to iron glance aggregate with continuous growth of (0001) or close to (0001); Red powder is called iron ocher; The rounded spherical or ellipsoidal hematite cemented block is called oolitic hematite. There are often concentric layers inside the oolite. The hematite with oolite diameter greater than 2mm is called pisolitic hematite; The hemispherical and cohesive dense block is called reniform hematite. The inner part of a single kidney is usually concentric or radial, and the smooth and bright red stalactite hematite is called red glass head. It can also be seen as a huge reniform body with radial and concentric layers. crystal is steel gray to iron black, often with light blue print color. Crystals or powders appear dark red to bright red. The stripes are cherry red or reddish brown. Semi metallic to metallic luster. The edge of thin slice or crystal fragment is blood red. No cleavage. The twin causes the splitting of parallel {0001} and U011}. It is formed under oxidation conditions, large-scale hematite is formed under sedimentation and hydrothermal conditions, and coexists with magnetite, quartze, chlorite, barite, siderite, etc. hematite is the main iron ore mineral. Pure powdered hematite is a natural mineral pigment.

Classification