What are hematite pyrite?

1. Physical properties

Steel gray to iron black, often with pale blue tints. Cryptocrystalline or powdery ones are dark red to bright red. Characteristic cherry red or reddish-brown streaks.

Metallic to semi-metallic, sometimes dull. No cleavage. Because the twin crystal can have and crack.

Hardness 5 6. Relative density.

Under polarizer: blood red, orange yellow, gray yellow. One axis crystal (-) no=, ne=.

2. Ore form

Single crystals are often plate-shaped, mainly composed of plate surfaces (parallel bifacials) and rhombohedr.

The relationship between the morphological characteristics of hematite and its formation conditions is that generally hematite formed by hydrothermal action can be in the form of plates, sheets or rhombohedral crystals. Mica hematite is a product of sedimentary metamorphism, and oolitic and kidney hematite are products of sedimentation.

3. Occurrence and combination

Formed under oxidation conditions, large hematite deposits are mostly related to hydrothermal or sedimentation. Hematite can be formed into sedimentary metamorphic iron ore, which is mainly composed of magnetite, hematite, and pseudo-hematite. Symbiosis with quartz, chlorite, etc.

Hematite in contact with metamorphic type is mainly symbiotic with sulfides such as magnetite, chalcopyrite, bornite, pyrrhotite, garnet, diopside, phlogopite, actinolite, etc.

In nature, magnetite and hematite can be converted into each other. When the oxygen fugitiveness increases, magnetite can be oxidized to hematite. If the crystal form of the original magnetite is still retained, it is called pseudo-hematite.

If magnetite is only partially converted to hematite, it is called pseudohematite. When the oxygen fugitiveness decreases, hematite can be reduced to magnetite. If the crystal form of hematite is still retained, it is called Mu hematite.

4. Identification characteristics

It is characterized by cherry red or reddish-brown streaks. It has various forms and non-magnetism, and can be distinguished from similar magnetite and ilmenite. Hematite is extremely widely distributed. Hematite can be formed by a variety of endogenous, exogenous or metamorphic processes.

The Longyan Iron Ore in Xuanhua, Hebei Province, China, and the Ningxiang Iron Ore Mine in Hunan are both hematite deposits formed by sedimentation. Hematite is often produced in sedimentary metamorphism, contact metamorphism, along with magnetite.

Mineral subspecies

1. Mirror iron ore is an aggregate of rose-shaped or flake hematite with metallic luster.

2. Mica hematite with metallic luster crystalline fine scale hematite.

3. Oolitic or kidney-shaped hematite is a oolitic or kidney-shaped hematite.

Hematite is one of the widely distributed iron minerals in nature, which can be formed in various geological processes, but mainly hydrothermal action, sedimentation and regional metamorphism. In the oxide zone, hematite can be formed by dehydration of limonite or goethite or goethite. But it can also be turned into goethite and hematite, etc.

Under reducing conditions, hematite can be transformed into magnetite, which is called pseudo-magnetite.

PyriteThe main components are cobalt, nickel, and selenium. It has a NaCl-type crystal structure. There are also traces of cobalt, nickel, copper, gold, selenium and other elements in the composition.

Pyrite is unstable in the oxide zone and easily decomposes to form iron hydroxide.

For example, goethite, etc., can form stable limonite after dehydration, and often depends on pyrite to form an illusion. This action often forms limonite or goethite and whenite in the surface outcropping part of the oxide zone of metal deposits, covering the ore body, so it is called iron cap.

The world's famous production areas include Spain, the Czech Republic and Slovakia.

The United States and China. China's proven pyrite reserves rank among the top in the world, and the famous producing areas include Yingde and Yunfu in Guangdong, Ma'anshan in Anhui, and ** factory in Gansu. Pyrite is the most widely distributed sulphide in the earth's crust.

In magmatic rocks, pyrite is fine disseminated, which is the product of hydrothermal action after the magmatic period.

In contact metasomatic deposits, pyrite often coexists with other sulfides and is formed in the later stages of hydrothermal interaction. In thermal staking deposits, pyrite is symbiotic with other sulfides, oxides, quartz, etc.; Sometimes huge accumulations of pyrite are formed. in sedimentary rocks.

In coal measure and sedimentary deposits, pyrite is agglomerate.

Tuberculosis or lens production. in metamorphic rocks.

, pyrite is often a new product of metamorphism.

The shape of the red iron ore is:

Hematite bodies have various morphologies, including flake, scale, granular, oolitic, kidney, soil, dense and lumpy. The color ranges from reddish-brown, steel gray to iron-black, and the streaks are cherry red. Metallic to semi-metallic luster, Morse hardness.

Specific gravity. Hematite is an iron mineral that is widely distributed in nature, is an important raw material for ironmaking, and can also be used as a red pigment.

Occurrence and assemblage of hematite:

Hematite is formed under oxidative conditions, and large hematite deposits are mostly related to hydrothermal or sedimentation. Hematite can be formed into sedimentary metamorphic iron ore, mainly composed of magnetite.

Hematite, made up of pseudo-hematite. with quartz, chlorite.

and other symbiosis. Hematite in contact with metamorphic type is mainly associated with magnetite, chalcopyrite, bornite, pyrrhotite and other sulfides.

and garnet, diopside.

Phlogopite, actinolite.

and other symbiosis. In nature, magnetite and hematite can be converted into each other. When the oxygen fugitiveness increases, magnetite can be oxidized to hematite.

If the crystal form of the original magnetite is still retained, it is called pseudo-hematite. If the magnetite is only partially converted into hematite, it is called pseudohematite. When the oxygen fugitiveness decreases, hematite can be reduced to magnetite.

If the crystal form of hematite is still retained, it is called Mu hematite.

Because of its light brass color and bright metallic luster, pyrite is often mistaken for **, so it is also called "fool's gold".

Pyrite is a disulfide of iron rolling. Pure pyrite contains iron and sulfur. In China, pyrite is generally used as a raw material for the production of sulfur and sulfuric acid, rather than as a raw material for refining iron, because there is better iron ore for refining iron.

Pyrite is widely distributed and can be found in many ores and rocks, including coal. It is generally a brass-colored cube. When pyrite weathers, it becomes limonite or yellow potash.

Pyrite can be produced by magmatic junction, hot water solution or sublimation, and can also be produced in igneous and sedimentary rocks.

The chemical composition of pyrite is FeS2, which is the main mineral raw material for the extraction of sulfur and the manufacture of sulfuric acid. Its crystals belong to the equiaxed crystal system. The composition usually contains small amounts of cobalt, nickel and tung selenium, and has a NaCl-type crystal structure.

There are often intact crystal shapes, which are cubes, octahedrons, pentagonal dodecahedrons and their clusters. There are fringes parallel to the crystal edge on the crystal surface of the cube, and the stripes on the large wheel of each crystal plane are perpendicular to each other. The aggregates are dense lumpy, granular, or nodular.

Light yellow (coppery) color, streaks greenish-black or brownish-black, strong metallic luster, opaque, non-cleavage, jagged fractures. The Mohs hardness is larger, up to the knife, and the knife does not move. Specific gravity.

It is easy to weatherize into limonite under surface conditions.

Pyrite is the most widely distributed sulphide mineral and can be found in all types of rocks. Pyrite is also a very inexpensive ancient gemstone. During the Victorian era (1837-1901 AD), people liked to decorate this gemstone with special form and ornamental value.

In addition to being used for polishing gemstones, it can also be used as a base for jewelry, jade and other handicrafts.

Pyrite is a yellow or yellow-brown solid, the main component is iron sulfide, the chemical formula FeS2, and impurities such as silica. Use the search for sulfur dioxide preparation. Shiqin and.

Ferrous metal minerals, iron, chromium and manganese. Everything else is non-ferrous metals.

What kind of mine does iron ore belong to? It belongs to ferrous metal ores. Iron ore is a type of stone that contains iron.