Kyanite introduction
Island structure silicate minerals. The composition of Al2[SIO4] is similar to that of andalusite and sillimanite. The triclinic system has a flat slab shape. Sometimes it is a radial aggregate. Blue, white with blue, cyan. There are two sets of complete and medium cleavage. The hardness has obvious anisotropy, so it is also known as the hard stone. The Mohs hardness was 4.5 in the direction of the parallel crystal elongation and 6 in the vertical direction. The specific gravity is 3.53 to 3.65. A product of regional metamorphism, occurring in crystalline schist and gneiss. Switzerland and Austria are well-known places of origin. When heated to 1300 ° C, the kyanite becomes mullite and is a high-grade refractory material. Aluminum can also be extracted. The transparent crystal can be used as a gemstone, preferably in dark blue. North Carolina, USA has dark blue and green gemstone kyanite.
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Kyanite, also known as bismuth stone, is a silicate mineral. It is a natural refractory raw material mineral with high refractoriness and high volume expansion. Kyanite is a triclinic system, usually a flat columnar crystal with parallel stripes on the face. Pale blue color or green color kyanite, light gray and the like. The hardness is 5.5-7.0, and the specific gravity is 3.53-3.65.
The main components of the mineral are kyanite and a small amount of sillimanite, the secondary mineral component is quartz, and the secondary mineral is biotite, phlogopite and chlorite. The theoretical composition of kyanite is 62.93%, which is 37.07%. Since kyanite mineral crystals often contain a small amount of by-product minerals, the content is generally not up to the theoretical value. For concentrates of kyanite minerals, the content is the sum of kyanite and impurity minerals.
Chemical composition: Al2O363.1%, SiO236.9%. Naturally produced kyanite is often close to the ideal component.
Causes of occurrence: Kyanite is one of the typical metamorphic minerals in the region, which is mostly metamorphosed by argillaceous rocks. It is mainly formed under conditions of high intermediate metamorphism pressure. Present in: regional metamorphic schist and gneiss and related crystalline granites and quartz veins; symbiotic with garnet, crossstone, mica and quartz.
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