An important use is in the manufacture of refractory products such as the bricks, mortars, and kiln furniture used in high-temperature furnaces. These are kyanite, andalusite, and sillimanite. The people who own these businesses are likely to be interested in kyanite and incorporate it into their product line. 9: Silikate (Germanate) A: Inselsilikate (Nesosilikate) F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in ,  und/oder nur  Koordination 15:Kyanit-Gruppe Lapis-Systematik Depending upon particle size, temperatures, and heating conditions, kyanite can expand to up to twice its original volume when heated. Diese variiert zwischen 6 und 7 in Richtung der b-Achse und 4,5 bis 5,5 in Richtung der c-Achse (Härteangaben nach Mohs). For foundries, the molds that are used for casting high-temperature metals are often made with kyanite. Contents. Kyanite has been used as a gemstone, though this use is limited by its anisotropism and perfect cleavage. Bhandara Minerals Pvt. 1 Structures Expand this section. Strukturell gehört er zu den Inselsilikaten. It is an "exotic" gem. Image copyright iStockphoto / Carl Kelliher. Kyanite is typically a blue aluminosilicate mineral, usually found in aluminium-rich metamorphic pegmatites and/or sedimentary rock.Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars.It is commonly found in quartz. Mineral Data, Mineralienatlas Lexikon, Kyanite. Kyanite often occurs in long, bladed crystals. ContentMinerals Metamorphic Index Minerals Revealing Secrets of Earth’s Deep Crust By Admin - July 2, 2020 0 Share Facebook Twitter Kyanite, a major index mineral, is often found with other metamorphic minerals like staurolite. Der allochromatische (fremdgefärbte) Edelstein ist in reiner Form farblos, erst durch Spurenelemente erhält er seine meist hell- bis dunkelblaue Farbe. Kyanite is a challenging mineral to cut because it has two distinctly different hardnesses. Juli 2019 um 15:25 Uhr bearbeitet. If you scratch a kyanite crystal across the long crystal axis, the hardness is 7, which is close to quartz. On the shorter side of the crystal the hardness is 6 to 7. Kyanite is also in products used in the automotive and railroad industries where heat resistance is important. Mullite, a form of calcined kyanite, is used to make brake shoes and clutch facings. Proceeding to kyanite, the chains are linked by SiO 4 tetrahedra and AlO 6 octahedra. Radiating kyanite: Sometimes kyanite occurs as radiating masses of crystals such as this specimen from Petaca, New Mexico. Kyanite is often associated with other metamorphic minerals such as garnet, staurolite, and corundum. A number of industrial minerals are formed by metamorphism, including kyanite for refractories, and garnet for abrasives. Perhaps that is what makes it so interesting? Kyanit bildet sich metamorph in Aluminium-reichen klastischen Sedimenten (meist Pelite), die mittleren bis hohen Temperaturen und Drucken ausgesetzt waren (mesozonale Metamorphose vom Barrow-Typ). Einige Fundpunkte kennt man allerdings auch in den Kantonen Graubünden und Wallis. Inexpensive mineral collections are available in the Geology.com Store. , Kyanit dient ebenso wie Andalusit und Sillimanit als Grundlage zur Herstellung hoch feuerfester Erzeugnisse sowie Porzellan. It is an aluminosilicate mineral that can occur in the same areas as quartz, and is in the same mineral family as Sillimanite and Andalusite. Oct 26, 2018 - Kyanite is named for the Greek word for blue, kyanos. , Kyanit ist ein typischer Gesteinsbildner und konnte als häufige Mineralbildung schon an vielen Fundorten nachgewiesen werden, wobei bisher (Stand: 2013) rund 1300 Fundorte als bekannt gelten. 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