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Calculated value is based on sets of microprobe analyses.","Vitreous,Silky","Vitreous in bulk, silky under magnification","Opaque","Black",[56],"black","Not fluorescent in UV","(001)","Perfect","Stratiform manganese deposit.","National Museum of Natural History (Smithsonian Institution), Washington, D.C., USA, NMNH 174879.","Serpentine Group. The Mn-analogue of Cronstedtite. Compare 'UM1969-14-SiO:FeHMn'.","Named in honour of Charles V. Guidotti (19 September 1935, Somerville, Massachusetts, USA - 19 May 2005, Boston, Massachusetts, USA), professor at the University of California, Davis (1962–1969), the University of Wisconsin–Madison (1969–1981), and the University of Maine (1981–2005), for his many contributions to phyllosilicate mineralogy. He also made important contributions to the petrologic studies of metamorphic rocks in the northern Appalachian Mountains of Maine.","2025-09-05 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II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa",-27.1361111,22.8647222,"South Africa",1,[168,171,175,180],{"id":169,"year":26,"html":170,"doi":11},16137779,"Williams, P.A., Hatert, F., Pasero, M. (2009) New minerals approved in 2009. in International Mineralogical Association, 1-34.",{"id":172,"year":27,"html":173,"doi":174},148367,"Wahle, Michael W.; Bujnowski, Thomas J.; Guggenheim, Stephen; Kogure, Toshihiro (2010) Guidottiite, the Mn-analogue of cronstedtite: a new serpentine-group mineral from South Africa. \u003Ci>Clays and Clay Minerals\u003C\u002Fi>,  58 (3). 364-376 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1346\u002Fccmn.2010.0580307'>doi:10.1346\u002Fccmn.2010.0580307\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Frruff_1.0\u002Fuploads\u002FCCM58_364.pdf' class='refpdflink'>\u003C\u002Fa>","10.1346\u002Fccmn.2010.0580307",{"id":176,"year":177,"html":178,"doi":179},397363,2014,"Belakovskiy, D., Gatta, G. D., Camara, F. (2014) New Mineral Names. \u003Ci>American Mineralogist\u003C\u002Fi>,  99 (1) 242-247 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam.2014.629'>doi:10.2138\u002Fam.2014.629\u003C\u002Fa>","10.2138\u002Fam.2014.629",{"id":181,"year":177,"html":182,"doi":11},16964691,"(2014) Guidottiite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Fguidottiite.pdf' class='refpdflink'>\u003C\u002Fa>",[],[185],{"id":186,"url":187,"label":188,"formula":189,"spacegroup":190,"year":27},5807,"\u002Fcif\u002F5807.cif","Wahle 2010","Mn1.854 Fe1.656 Mg.537 Si.953 O9 H4","P 63",[192,193],"Guidottiiet","IMA2009-061",[195,199,204,208],{"lang":196,"names":197},"ca",[198],"Guidottiïta",{"lang":200,"names":201},"de",[202,203],"Guidottiit","IMA 2009-061",{"lang":205,"names":206},"eu",[207],"Guidottiita",{"lang":209,"names":210},"it",[211],"guidottiite","Q19841402",{"history":11,"applications":11}]