Magnesite-Genesis
There are two main causes of magnesite. First, the external origin, produced in sedimentary rocks: magnesite crystals, these layered clastic sedimentary rocks mostly carry organic components from the organism - such as (black) shale, coal seams, etc., in other words, magnesite is In the case of hypoxia, it is formed by biological action; secondly, it is formed in the hydrothermal vein of medium to low temperature: magnesite is common in metamorphic sedimentary rocks, which is a gangue mineral formed after hydrothermal accumulation; in addition, pegmatite Magnesite may also appear in the middle. Common symbiotic minerals are: quartz, pyrite, limonite, goethite, chalcopyrite, sphalerite, cryolite, Galena, barite, calcite, dolomite, fluorite, and the like. Because of the similar crystal structure of each mineral, they have many similar physical properties, including: belonging to the trigonal system, the trigonal crystal is mostly rhombohedron or scalenohedron, and there are three groups of well-developed rhombohedron cleavage, transparent The face crystal has a double refraction phenomenon or the like. In fact, the cations in the mineral composition can be completely substituted with each other to form a series of solid solutions, so the resolution between minerals may become more difficult.
Magnesite is produced from sedimentary rocks with organic components, such as black shale and coal seams. Imagine the formation environment of magnesite: an ancient swamp area, with many plant debris, such as dried wood, branches and leaves. This is a hotbed of coal and coal formation in the future. Because of the water and dissolved magnesium in this environment, it is an oxygen-deficient environment, so it is also suitable for the formation of magnesite, which is the common magnesite in coal-bearing sedimentary rocks. the reason.
The magnesite in these sedimentary rocks is mostly produced by layered or nodule (concretion). The so-called nodules are crystals of magnesite crystals, coated with a core, and then coated and grown to the outer layer. Most of this core is other minerals such as pyrite, sphalerite, and chert.
For a long time, chemists regarded magnesium oxides obtained from the calcination of magnesium carbonate-containing magnesite as unreplaceable substances. It was listed in the element table published by Lavoisier in 1789. In 1808, after successfully producing calcium, David succeeded in producing magnesium metal using the same method. From then on, magnesium was identified as an element and was named magnesium, and the element symbol was Mg. Magnesium comes from the Greek city of Magnesia, because it produces magnesium oxide near the city, called magnesiaalba, white magnesium oxide. However, the name magnesium of magnesium is easily confused with the name manganum of manganese. Although some people have proposed changes, it has been used.
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