janggunite, rare, manganese, oxide, mineral, with, chemical, formula, found, south, koreageneralcategoryoxide, mineralformula, repeating, unit, 6ima, symboljgn, strunz, classification4, 05crystal, systemorthorhombicspace, grouppmanunit, cella, 4identificationc. Janggunite is a rare manganese oxide mineral with the chemical formula Mn5 x Mn Fe 1 xO8 OH 6 JangguniteJanggunite found in South KoreaGeneralCategoryOxide mineralFormula repeating unit Mn5 x Mn Fe 1 xO8 OH 6IMA symbolJgn 1 Strunz classification4 FG 05Crystal systemOrthorhombicSpace groupPmanUnit cella 9 324 b 14 05 c 7 956 A Z 4IdentificationColorBlackCleavagePerfect one directionTenacityFragileMohs scale hardness2 3LusterDullStreakBrownish black to dark brownSpecific gravity3 59Optical propertiesBiaxialReferences 2 3 4 It was first described in 1975 for an occurrence in the Janggun mine Bonghwa gun Gyeongsangbuk do South Korea and named for the locality 3 References edit Warr L N 2021 IMA CNMNC approved mineral symbols Mineralogical Magazine 85 3 291 320 Bibcode 2021MinM 85 291W doi 10 1180 mgm 2021 43 S2CID 235729616 Handbook of Mineralogy a b Mindat org Webmineral data This article about a specific oxide mineral is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Janggunite amp oldid 1138742020, wikipedia, wiki, book, books, library,
