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Petersen, Lawrence M. Anovitz, and Eric J. Essene in honor of Donald Ralph Peacor [b. 1937 Somerville, Massachusetts, USA], mineralogist at the University of Michigan, in recognition of his work on pyroxenes and manganese minerals.  He authored\u002Fcoauthored descriptions of approximately 90 new minerals and worked on the structure of many others.","2026-05-11 17:08:33",[],[77,84,91],{"id":78,"name":79,"entrytype":9,"csystem":37,"ima_formula":80,"mindat_formula":80,"hmin":46,"hmax":47,"dmeas":81,"dcalc":82,"primary_image_id":83},1384,"Enstatite","Mg\u003Csub>2\u003C\u002Fsub>Si\u003Csub>2\u003C\u002Fsub>O\u003Csub>6\u003C\u002Fsub>","3.2","3.189",5844,{"id":85,"name":86,"entrytype":9,"csystem":37,"ima_formula":87,"mindat_formula":87,"hmin":46,"hmax":47,"dmeas":88,"dcalc":89,"primary_image_id":90},1528,"Ferrosilite","Fe\u003Csup>2+\u003C\u002Fsup>\u003Csub>2\u003C\u002Fsub>Si\u003Csub>2\u003C\u002Fsub>O\u003Csub>6\u003C\u002Fsub>","3.60","4.00",8826,{"id":92,"name":93,"entrytype":9,"csystem":37,"ima_formula":80,"mindat_formula":80,"hmin":11,"hmax":11,"dmeas":11,"dcalc":11,"primary_image_id":11},51821,"Protoenstatite",[],[96],{"id":97,"name":98,"entrytype":9,"csystem":99,"ima_formula":100,"mindat_formula":101,"hmin":47,"hmax":47,"dmeas":102,"dcalc":88,"primary_image_id":103},2154,"Kanoite","Monoclinic","MnMgSi\u003Csub>2\u003C\u002Fsub>O\u003Csub>6\u003C\u002Fsub>","Mn\u003Csup>2+\u003C\u002Fsup>(Mg,Mn\u003Csup>2+\u003C\u002Fsup>)Si\u003Csub>2\u003C\u002Fsub>O\u003Csub>6\u003C\u002Fsub>","3.66",12947,[105],{"id":106,"txt":107,"latitude":108,"longitude":109,"country":110},5833,"Empire State No. 4 Mine, Balmat, Fowler, St. Lawrence County, New York, USA",44.263925,-75.409329,"USA",4,[113,116,121,125],{"id":114,"year":27,"html":115,"doi":11},527923,"Peterson, Erich U., Anovitz, Lawrence M., Essene, Eric J. (1984) Donpeacorite, (Mn,Mg)MgSi2O6, a new orthopyroxene and its proposed phase relations in the system MnSiO3-MgSiO3-FeSiO3. \u003Ci>American Mineralogist\u003C\u002Fi>,  69 (5-6). 472-480 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM69\u002FAM69_472.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":117,"year":118,"html":119,"doi":120},127406,1996,"Gnos, Edwin, Armbruster, Thomas, Nyfeler, Daniel (1996) Kanoite, donpeacorite and tirodite: Mn-Mg-silicates from a manganiferous quartzite in the United Arab Emirates. \u003Ci>European Journal of Mineralogy\u003C\u002Fi>,  8 (2) 251-262 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1127\u002Fejm\u002F8\u002F2\u002F0251'>doi:10.1127\u002Fejm\u002F8\u002F2\u002F0251\u003C\u002Fa>","10.1127\u002Fejm\u002F8\u002F2\u002F0251",{"id":122,"year":123,"html":124,"doi":11},16964018,2001,"(2001) Donpeacorite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Fdonpeacorite.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":126,"year":127,"html":128,"doi":129},395131,2005,"Stimpfl, Marilena (2005) The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene. \u003Ci>American Mineralogist\u003C\u002Fi>,  90 (1) 155-161 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam.2005.1577'>doi:10.2138\u002Fam.2005.1577\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Fdoclib\u002Fam\u002Fvol90\u002FAM90_155.pdf' class='refpdflink'>\u003C\u002Fa>","10.2138\u002Fam.2005.1577",[131],{"id":132,"source_url":133,"license_code":134,"credit_html":135,"title":136,"description":137,"author":138,"original_width":139,"original_height":140},7350,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=160262036","CC BY 4.0","David Hospital, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=160262036\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Donpeacorite.jpg","Single crystal group of the rare Mn-Mg silicate mineral donpeacorite from the TL in Balmat, New York (Balmat, St Lawrence County, New York, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium.","David Hospital",768,521,[142,148,153,158],{"id":143,"url":144,"label":145,"formula":146,"spacegroup":147,"year":127},3911,"\u002Fcif\u002F3911.cif","Stimpfl 2005 · Mg1.433 Mn.541 Ti.002 Ca.024 Si1.997 Al.003 O6","Mg1.433 Mn.541 Ti.002 Ca.024 Si1.997 Al.003 O6","P b c a",{"id":149,"url":150,"label":151,"formula":152,"spacegroup":147,"year":127},3913,"\u002Fcif\u002F3913.cif","Stimpfl 2005 · Mg1.433 Mn.542 Ti.002 Ca.024 Si1.997 Al.003 O6","Mg1.433 Mn.542 Ti.002 Ca.024 Si1.997 Al.003 O6",{"id":154,"url":155,"label":156,"formula":157,"spacegroup":147,"year":127},3914,"\u002Fcif\u002F3914.cif","Stimpfl 2005 · Mg1.433 Mn.509 Ti.002 Ca.024 Si1.997 Al.003 O6","Mg1.433 Mn.509 Ti.002 Ca.024 Si1.997 Al.003 O6",{"id":159,"url":160,"label":161,"formula":162,"spacegroup":147,"year":27},3917,"\u002Fcif\u002F3917.cif","Petersen 1984","Mg1.47 Mn.53 Si2 O6",[],[165,169,174,178,182],{"lang":166,"names":167},"ca",[168],"donpeacorita",{"lang":170,"names":171},"de",[172,173],"Donpeacorit","IMA 1982-045",{"lang":175,"names":176},"eu",[177],"Donpeacorita",{"lang":179,"names":180},"it",[181],"donpeacorite",{"lang":183,"names":184},"nl",[185],"Donpeacoriet","Q1242102",{"history":11,"applications":11}]