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About: Afghanite     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatPotassiumMinerals, within Data Space : dbpedia.org associated with source document(s)

Type: Thingdul:ChemicalObjectchemical substanceMineralmineralyago:WikicatCalciumMineralsyago:WikicatCarbonateMineralsyago:WikicatSilicateMineralsyago:WikicatSodiumMineralsyago:WikicatSulfateMineralsyago:Abstraction100002137yago:Material114580897yago:Matter100020827yago:Mineral114662574yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921yago:WikicatHexagonalMineralsyago:Substance100019613yago:WikicatAluminiumMineralsyago:WikicatPotassiumMinerals New Facet based on Instances of this Class

Afghanite, (Na,K)22Ca10[Si24Al24O96](SO4)6Cl6, 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 trigonal crystal system. The lowering of the symmetry from typical (for cancrinite group) hexagonal one is due to ordering of Si and Al. 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.