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Афганит Afghanite Afghanita Afghanite Afghanite Afghaniet Afeganite Afghanit
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La afghanita es un mineral de la clase tectosilicatos, del llamado grupo de la cancrinita. Fue descubierto en 1967 y el nombre deriva del país en que se descubrió, Afganistán.Suele aparecer en forma de vetas delgadas cortando a cristales de lazurita. Afghanit ist ein selten vorkommendes Mineral aus der Mineralklasse der „Silikate und Germanate“. Es kristallisiert im trigonalen Kristallsystem mit der chemischen Zusammensetzung (Na,K)22Ca10(Si24Al24)O96(SO4)6Cl6. Die in den runden Klammern angegebenen Elemente Natrium und Kalium können sich dabei in der Formel jeweils gegenseitig vertreten (Substitution, Diadochie), stehen jedoch immer im selben Mengenverhältnis zu den anderen Bestandteilen des Minerals. L'afghanite è un minerale della classe dei tettosilicati, appartenente al gruppo della cancrinite-sodalite e descritto, per la prima volta, nel 1968 presso le miniere di lazurite di Sar-i Sang in Afghanistan (da cui il nome). Afghaniet (Afghanit of Afghanita) (Na, Ca, K)8(Si, Al)12O24(SO4,Cl, CO3)3·H2O is een mineraal van natrium, calcium, kalium, silicium, aluminium, zuurstof, zwavel, chloor, koolstof en waterstof. Het is genoemd naar Afghanistan. De hardheid op de schaal van Mohs is 5,5 tot 6. Afghanite, (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3·0.5H2O, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumino-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. It forms blue to colorless, typically massive crystals in the hexagonal crystal system. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. It has refractive index values of nω=1.523 and nε=1.529. L'afghanite est un minéral hydraté du groupe des (alumino-)silicates (sous-groupe des tectosilicates), de composition (Na,Ca,K)8(AlSiO4)6(SO4,Cl2,CO3)3 • 0,5 H2O. Afeganite é um mineral composto aluminossilicato de sulfato, cloreto e carbonato de sódio, cálcio e potássio, cuja fórmula química é (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3 · 0.5H2O. A afeganite é um feldspatóide, do grupo da cancrinita e normalmente ocorre com minerais do grupo da sodalita. Ocorre em veios nos cristais de lazurite e em xenólitos calcários em pedra-pomes.Varia de azul a incolor, tem cristais maciços no sistema hexagonal. Tem dureza Mohs de 5,5 a 6 e densidade 2,55-2,65. Афганит, (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3 · 0.5H2O - минерал класса силикатов, гидратированный алюмосиликат с дополнительными анионами в кристаллической решетке. Афганит - фельдшпатоид, встречающийся обычно с содалитом. Он образует типичные шестигранные кристаллы голубого цвета.
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Afghanite, (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3·0.5H2O, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumino-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. It forms blue to colorless, typically massive crystals in the hexagonal crystal system. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. It has refractive index values of nω=1.523 and nε=1.529. It has one direction of perfect cleavage and exhibits conchoidal fracture. It fluoresces a bright orange. It was discovered in 1968 in the Lapis-lazuli Mine, Sar-e-Sang, Badakhshan Province, Afghanistan and takes its name from that country. It has also been described from localities in Germany, Italy, the Pamir Mountains, Tajikistan, near Lake Baikal in Siberia, New York and Newfoundland. It occurs as veinlets in lazurite crystals in the Afghan location and in altered limestone xenoliths within pumice in Pitigliano, Tuscany, Italy. L'afghanite è un minerale della classe dei tettosilicati, appartenente al gruppo della cancrinite-sodalite e descritto, per la prima volta, nel 1968 presso le miniere di lazurite di Sar-i Sang in Afghanistan (da cui il nome). Afghanit ist ein selten vorkommendes Mineral aus der Mineralklasse der „Silikate und Germanate“. Es kristallisiert im trigonalen Kristallsystem mit der chemischen Zusammensetzung (Na,K)22Ca10(Si24Al24)O96(SO4)6Cl6. Die in den runden Klammern angegebenen Elemente Natrium und Kalium können sich dabei in der Formel jeweils gegenseitig vertreten (Substitution, Diadochie), stehen jedoch immer im selben Mengenverhältnis zu den anderen Bestandteilen des Minerals. Chemisch gesehen ist Afghanit damit ein Natrium-Kalium-Calcium-Alumosilikat mit zusätzlichen Chlor- und Sulfat- ([SO4]2−) Anionen. Strukturell gehört er zu den Gerüstsilikaten.Afghanit ist durchsichtig und entwickelt dick- bis dünntafelige, leistenförmige Kristalle mit glasähnlichem Glanz, findet sich aber auch in Form abgerundeter Körner. Seine Farbe variiert zwischen Hell- und Dunkelblau, in dünnen Schichten ist er allerdings farblos. Afeganite é um mineral composto aluminossilicato de sulfato, cloreto e carbonato de sódio, cálcio e potássio, cuja fórmula química é (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3 · 0.5H2O. A afeganite é um feldspatóide, do grupo da cancrinita e normalmente ocorre com minerais do grupo da sodalita. Ocorre em veios nos cristais de lazurite e em xenólitos calcários em pedra-pomes.Varia de azul a incolor, tem cristais maciços no sistema hexagonal. Tem dureza Mohs de 5,5 a 6 e densidade 2,55-2,65. Tem valores de índice de refracção de nω = nε = 1,523 e 1,529. Tem uma direcção de clivagem perfeita e exibe uma fractura concoidal (em forma de concha). Tem uma fluorescência cor-de-laranja brilhante.Foi descoberto em 1968 numa mina de lápis-lazúli, em Sar-e-Sang na Província de Badakhshan, Afeganistão e recebeu o nome desse país. Também tem sido encontrado na Alemanha, Itália, montanhas Pamir no Tadjiquistão, lago Baikal na Sibéria, em Nova Iorque nos Estados Unidos e Terra Nova, Canadá.== Referências == Mineral Data Publishing 2001 Mindat with location data Webmineral data Афганит, (Na,Ca,K)8[Al6Si6O24](SO4,Cl2,CO3)3 · 0.5H2O - минерал класса силикатов, гидратированный алюмосиликат с дополнительными анионами в кристаллической решетке. Афганит - фельдшпатоид, встречающийся обычно с содалитом. Он образует типичные шестигранные кристаллы голубого цвета. La afghanita es un mineral de la clase tectosilicatos, del llamado grupo de la cancrinita. Fue descubierto en 1967 y el nombre deriva del país en que se descubrió, Afganistán.Suele aparecer en forma de vetas delgadas cortando a cristales de lazurita. Afghaniet (Afghanit of Afghanita) (Na, Ca, K)8(Si, Al)12O24(SO4,Cl, CO3)3·H2O is een mineraal van natrium, calcium, kalium, silicium, aluminium, zuurstof, zwavel, chloor, koolstof en waterstof. Het is genoemd naar Afghanistan. De hardheid op de schaal van Mohs is 5,5 tot 6. L'afghanite est un minéral hydraté du groupe des (alumino-)silicates (sous-groupe des tectosilicates), de composition (Na,Ca,K)8(AlSiO4)6(SO4,Cl2,CO3)3 • 0,5 H2O.
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