[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:748":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":11,"polytypeof":11,"groupid":12,"weighting":13,"nolocadd":14,"blacklisted":14,"mindat_formula":15,"mindat_formula_note":11,"ima_formula":15,"elements":16,"sigelements":20,"key_elements":21,"impurities":11,"cim":22,"ima_status":23,"ima_notes":11,"ima_history":11,"approval_year":11,"publication_year":25,"discovery_year":26,"strunz10ed1":27,"strunz10ed2":28,"strunz10ed3":29,"strunz10ed4":30,"dana8ed1":31,"dana8ed2":32,"dana8ed3":32,"dana8ed4":33,"csystem":34,"cclass":35,"spacegroup":11,"spacegroupset":36,"a":37,"b":38,"c":39,"alpha":36,"beta":36,"gamma":36,"aerror":11,"berror":11,"cerror":11,"alphaerror":11,"betaerror":11,"gammaerror":11,"va3":11,"z":40,"csmetamict":14,"commentcrystal":41,"twinning":11,"tranglide":11,"parting":11,"epitaxidescription":11,"morphology":42,"tlform":11,"hmin":43,"hmax":44,"hardtype":11,"vhnmin":36,"vhnmax":36,"vhnerror":11,"vhng":11,"vhns":11,"commenthard":11,"dmeas":45,"dmeas2":46,"dcalc":47,"dmeaserror":11,"dcalcerror":11,"commentdense":11,"lustre":11,"lustretype":48,"commentluster":11,"diapheny":49,"streak":50,"colour":51,"commentcolor":11,"colors":52,"streak_colors":56,"luminescence":11,"uv":57,"cleavage":11,"cleavagetype":58,"fracturetype":59,"tenacity":60,"commentbreak":11,"opticaltype":61,"opticalsign":11,"opticalalpha":36,"opticalalpha2":36,"opticalalphaerror":11,"opticalbeta":36,"opticalbeta2":36,"opticalbetaerror":11,"opticalgamma":36,"opticalgamma2":36,"opticalgammaerror":11,"opticalomega":36,"opticalomega2":36,"opticalomegaerror":11,"opticalepsilon":36,"opticalepsilon2":36,"opticalepsilonerror":11,"opticaln":36,"opticaln2":36,"opticalnerror":11,"optical2vcalc":36,"optical2vcalc2":36,"optical2vcalcerror":11,"optical2vmeasured":36,"optical2vmeasured2":36,"optical2vmeasurederror":11,"rimin":11,"rimax":11,"opticaldispersion":11,"opticalpleochroism":11,"opticalpleochorismdesc":11,"opticalbirefringence":11,"opticalcomments":62,"opticalcolour":11,"opticalinternal":11,"opticaltropic":11,"opticalanisotropism":11,"opticalbireflectance":11,"opticalextinction":11,"opticalr":11,"specdispm":11,"ir":11,"electrical":11,"magnetism":11,"thermalbehaviour":11,"other":11,"industrial":11,"occurrence":63,"otheroccurrence":11,"type_specimen_store":64,"description_short":65,"aboutname":66,"rock_parent":11,"rock_parent2":11,"rock_root":9,"rock_bgs_code":11,"meteoritical_code":11,"updttime":67,"reviewed_at":11,"variety_of":11,"varieties":68,"group_members":69,"associates":110,"confused_with":111,"type_localities":128,"occurrence_total":108,"citations":135,"images":151,"structures":152,"synonyms":159,"language_names":162,"wikidata_qid":184,"texts":185},748,"1:1:748:9","e1da71aa-6ee6-4264-9c1e-ffa3ab3642e4","Bracewellite","Bwe",0,"mineral",null,39566,12,false,"CrO(OH)",[17,18,19],"Cr","O","H",[17,18,19],[17],"7.14.2",[24],"APPROVED",1976,"1967","4","F","D","10","6","1","5","Orthorhombic",8,"0","4.492","9.860","2.974",4,"Space Group originally given is Pbnm","Very rarely as \"minute deep red to black prismatic crystals [60-200 microns in size] of bracewellite line microscopic fissures and vugs in merumite\". bracewellite is not present in all alluvial grains of merumite and, when present, has been found to constitute negligible amounts and in rare cases, up to a dominant part, of a merumite grain. ",5.5,6.5,"4.45","4.48","4.28","Sub-Vitreous,Sub-Metallic","Translucent,Opaque","Dark brown","Deep red to black",[53,54,55],"red","black","brown",[55],"Not fluorescent in UV","None Observed","Irregular\u002FUneven","brittle","Biaxial","RI is not reported for this species as the refractive indices are probably very high, and more impostantly, the mineral is very dark, approaching opaque. No reflected light studies are known.","In an alluvial placer deposit, in fine-grained intergrowth with other chromium oxide-hydroxide minerals","The Natural History Museum, London, England (No. 1979,136)","Minute prismatic crystals in vugs or intergrown in the groundmass of eskolaite masses. As with other Cr mineral species from the Merume River locality, such as grimaldiite, guyanaite, and mcconnellite, this species is not universally present in every s...","Named in 1967 by Charles Milton, Daniel  E. Appleman, Edward Ching-Te Chao, Frank Cuttita, Joseph I. Dinnin, Edward J. Dwornik, Margaret Hall, Blanche L. Ingram, and Harry J. Rose, Jr. in honor of Smith Bracewell [active as a geological author at least in the time period 1927-1962], formerly Director, British Guyana Geological Survey and professor at the University of the West Indies, who first noted the occurrence of merumite, which proved to be eskolaite with a mixture of chromium minerals, including the mineral subsequently named for him.","2025-08-11 12:14:18",[],[70,78,87,95,103],{"id":71,"name":72,"entrytype":9,"csystem":34,"ima_formula":73,"mindat_formula":73,"hmin":44,"hmax":74,"dmeas":75,"dcalc":76,"primary_image_id":77},1285,"Diaspore","AlO(OH)",7,"3.2","3.38",7183,{"id":79,"name":80,"entrytype":9,"csystem":34,"ima_formula":81,"mindat_formula":82,"hmin":83,"hmax":43,"dmeas":84,"dcalc":85,"primary_image_id":86},1719,"Goethite","FeO(OH)","Fe\u003Csup>3+\u003C\u002Fsup>O(OH)",5,"4.27","4.18",29787,{"id":88,"name":89,"entrytype":9,"csystem":34,"ima_formula":90,"mindat_formula":90,"hmin":91,"hmax":40,"dmeas":92,"dcalc":93,"primary_image_id":94},1756,"Groutite","Mn\u003Csup>3+\u003C\u002Fsup>O(OH)",3.5,"4.144","4.172",10513,{"id":96,"name":97,"entrytype":9,"csystem":34,"ima_formula":98,"mindat_formula":99,"hmin":43,"hmax":44,"dmeas":100,"dcalc":101,"primary_image_id":102},2769,"Montroseite","(V\u003Csup>3+\u003C\u002Fsup>,Fe\u003Csup>2+\u003C\u002Fsup>,V\u003Csup>4+\u003C\u002Fsup>)O(OH)","(V\u003Csup>3+\u003C\u002Fsup>,Fe\u003Csup>3+\u003C\u002Fsup>)O(OH)","4.0","4.11",16684,{"id":104,"name":105,"entrytype":9,"csystem":34,"ima_formula":106,"mindat_formula":106,"hmin":107,"hmax":108,"dmeas":36,"dcalc":109,"primary_image_id":11},11481,"Tsumgallite","GaO(OH)",1,2,"5.08",[],[112,113,114,121,122,127],{"id":71,"name":72,"entrytype":9,"csystem":34,"ima_formula":73,"mindat_formula":73,"hmin":44,"hmax":74,"dmeas":75,"dcalc":76,"primary_image_id":77},{"id":79,"name":80,"entrytype":9,"csystem":34,"ima_formula":81,"mindat_formula":82,"hmin":83,"hmax":43,"dmeas":84,"dcalc":85,"primary_image_id":86},{"id":115,"name":116,"entrytype":9,"csystem":117,"ima_formula":15,"mindat_formula":15,"hmin":91,"hmax":118,"dmeas":101,"dcalc":119,"primary_image_id":120},1750,"Grimaldiite","Trigonal",4.5,"4.13",10469,{"id":88,"name":89,"entrytype":9,"csystem":34,"ima_formula":90,"mindat_formula":90,"hmin":91,"hmax":40,"dmeas":92,"dcalc":93,"primary_image_id":94},{"id":123,"name":124,"entrytype":9,"csystem":34,"ima_formula":15,"mindat_formula":15,"hmin":11,"hmax":11,"dmeas":36,"dcalc":125,"primary_image_id":126},1783,"Guyanaite","4.67",8072,{"id":96,"name":97,"entrytype":9,"csystem":34,"ima_formula":98,"mindat_formula":99,"hmin":43,"hmax":44,"dmeas":100,"dcalc":101,"primary_image_id":102},[129],{"id":130,"txt":131,"latitude":132,"longitude":133,"country":134},1969,"Merume River, Rest of Region 8, Potaro-Siparuni Region, Guyana",5.2666667,-59.8333333,"Guyana",[136,139,143,147],{"id":137,"year":25,"html":138,"doi":11},16103808,"Milton, C., Appleman, D. E., Appleman, M. H., Chao, E. C. T., Cuttitta, F., Dinnin, J. I., Dwornik, E. J., Ingram, B. L. and Rose, H. J., Jr. (1976) Merumite, a complex assemblage of chromium minerals from Guyana. U.S. Geological Survey Professional Paper 887: 1-29.",{"id":140,"year":141,"html":142,"doi":11},526875,1977,"Fleischer, Michael, Cabri, Louis J., Nickel, Ernest H., Pabst, Adolf (1977) New Mineral Names. \u003Ci>American Mineralogist\u003C\u002Fi>,  62 (5-6) 593-600 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002Fammin\u002FAM62\u002FAM62_593.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":144,"year":145,"html":146,"doi":11},16103810,1997,"Anthony, J.W., et al. (1997) Handbook of Mineralogy, Vol. 3: 75.",{"id":148,"year":149,"html":150,"doi":11},16963340,2005,"(2005) Bracewellite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002Fbracewellite.pdf' class='refpdflink'>\u003C\u002Fa>",[],[153],{"id":154,"url":155,"label":156,"formula":157,"spacegroup":158,"year":25},1824,"\u002Fcif\u002F1824.cif","Milton 1976","Cr O2 H","P b n m",[160,161],"Bracewelliet","IMA1967-035",[163,168,173,177,180],{"lang":164,"names":165},"ca",[166,167],"bracewel·lita","bracewellita",{"lang":169,"names":170},"de",[171,172],"Bracewellit","IMA 1967-035",{"lang":174,"names":175},"eu",[176],"Bracewellita",{"lang":178,"names":179},"it",[7],{"lang":181,"names":182},"zh",[183],"羟铬矿","Q3643405",{"history":11,"applications":11}]