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Hematite

Hematite

Feature of Hematite

Chemical composition of Fe2O3, hematite crystals of trigonal system oxide minerals. Magnetic hematite with cubic system into homogenous like more. Crystal often assumes the slab; Collection plate shaped, usually scaly, reniform, oolitic, block or earthy, etc. A reddish brown, such as steel grey to iron black color, streaks are fuchsia. Metal to a half metallic luster. Moss hardness is 5.5 ~ 6.5, the proportion of 4.9 ~ 5.3. Is iron black, metal luster, hematite is called the ends of the sheet iron ore; A steel gray, metallic luster, scaly called mica hematite, the ancient Chinese called “cloud son iron”; Is reddish brown soil and tarnish called ocher, called “generation of ochre” in ancient China, and to “ochre” refers to hematite.

Distribution of Hematite

Hematite is widely distributed in the accessory minerals of all kinds of rocks, it is fine dispersive granular appeared in a lot of igneous rock, under special circumstances, the regional metamorphic rocks formed in the big block. In red sandstone, the hematite is cement, quartz particles and rock with colors. To be economically worth mining, it must contain tens of millions of tons of hematite, the reserves is caused by large scale deposition, in the former Cambrian strata have a lot of this kind of iron ore, they are usually containing silicon impurity.

Hematite ore form

Single crystal is tabular, mainly by the panel (parallel double) and rhombohedron of combination. Collection in a variety of forms: show crystalline flake, scaly or block; Aphanitic qualitative and oolitic, reniform, powder and earthy, etc. Hematite according to morphological characteristics, and have the following some of the names: with metallic flake collection, called specularite; Metallic luster of fine flaky aggregate, called mica hematite; The oolitic or kidney shaped said oolitic hematite or reniform; Powder hematite iron ocher. Hematite: is the relationship between morphological characteristics and its forming conditions generally formed by hydrothermal process of hematite can show plate, sheet, or the rhombohedron crystal form; Mica hematite is the product of sedimentary metamorphism; Oolitic hematite and reniform is the product of sedimentation.

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