coronadite, lead, endmember, hollandite, group, family, tectomanganates, with, tunnel, structure, mineral, named, after, francisco, vasquez, coronado, explorer, southwest, name, made, waldemar, lindgren, 1905, polyhedral, representation, tunnel, structure, cor. Coronadite is the lead endmember of the hollandite group a family of tectomanganates with a 2 x 2 tunnel structure The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest USA The name was made up by Waldemar Lindgren in 1905 2 Polyhedral representation of the 2 x 2 tunnel structure of coronadite The black atoms represent Pb coronaditeCoronaditaGeneralCategoryhydroxidesFormula repeating unit Pb Mn4 6Mn3 2 O16IMA symbolCor 1 Strunz classification4 D 08 70Dana classification7 9 1 4Crystal systemmonoclinicSpace groupI2 mUnit cella 9 938 b 2 8678 c 9 834 Z 1 b 90 39 V 280 26IdentificationFormula mass933 55Colourdark grey to blackCrystal habitBotryoidal fibrousMohs scale hardness4 5 5LustersubmetallicStreakbrownish blackDiaphaneityopaqueDensity5 44Refractive index2 72 Pleochroismbrown greyCommon impuritiesFe AlReferences 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 Coronadite Mineral Data webmineral com Retrieved from https en wikipedia org w index php title Coronadite amp oldid 1176443944, wikipedia, wiki, book, books, library,
