[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:471235":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":6,"synid":6,"polytypeof":6,"groupid":6,"weighting":11,"nolocadd":12,"blacklisted":12,"mindat_formula":13,"mindat_formula_note":6,"ima_formula":6,"elements":14,"sigelements":22,"key_elements":23,"impurities":6,"cim":6,"ima_status":24,"ima_notes":6,"ima_history":6,"approval_year":6,"publication_year":6,"discovery_year":6,"strunz10ed1":26,"strunz10ed2":27,"strunz10ed3":28,"strunz10ed4":29,"dana8ed1":6,"dana8ed2":6,"dana8ed3":6,"dana8ed4":6,"csystem":30,"cclass":31,"spacegroup":11,"spacegroupset":32,"a":33,"b":34,"c":35,"alpha":6,"beta":36,"gamma":6,"aerror":31,"berror":37,"cerror":38,"alphaerror":6,"betaerror":39,"gammaerror":6,"va3":6,"z":40,"csmetamict":12,"commentcrystal":6,"twinning":6,"tranglide":6,"parting":6,"epitaxidescription":6,"morphology":6,"tlform":41,"hmin":6,"hmax":6,"hardtype":6,"vhnmin":6,"vhnmax":6,"vhnerror":6,"vhng":6,"vhns":6,"commenthard":42,"dmeas":6,"dmeas2":6,"dcalc":43,"dmeaserror":6,"dcalcerror":6,"commentdense":6,"lustre":6,"lustretype":44,"commentluster":6,"diapheny":45,"streak":46,"colour":47,"commentcolor":6,"colors":48,"streak_colors":50,"luminescence":6,"uv":51,"cleavage":52,"cleavagetype":53,"fracturetype":6,"tenacity":54,"commentbreak":6,"opticaltype":55,"opticalsign":56,"opticalalpha":57,"opticalalpha2":6,"opticalalphaerror":58,"opticalbeta":59,"opticalbeta2":6,"opticalbetaerror":58,"opticalgamma":60,"opticalgamma2":6,"opticalgammaerror":58,"opticalomega":6,"opticalomega2":6,"opticalomegaerror":6,"opticalepsilon":6,"opticalepsilon2":6,"opticalepsilonerror":6,"opticaln":6,"opticaln2":6,"opticalnerror":6,"optical2vcalc":61,"optical2vcalc2":6,"optical2vcalcerror":6,"optical2vmeasured":62,"optical2vmeasured2":6,"optical2vmeasurederror":40,"rimin":63,"rimax":64,"opticaldispersion":65,"opticalpleochroism":66,"opticalpleochorismdesc":6,"opticalbirefringence":6,"opticalcomments":6,"opticalcolour":6,"opticalinternal":6,"opticaltropic":6,"opticalanisotropism":6,"opticalbireflectance":6,"opticalextinction":67,"opticalr":6,"specdispm":6,"ir":6,"electrical":6,"magnetism":6,"thermalbehaviour":6,"other":6,"industrial":6,"occurrence":68,"otheroccurrence":6,"type_specimen_store":69,"description_short":70,"aboutname":71,"rock_parent":6,"rock_parent2":6,"rock_root":9,"rock_bgs_code":6,"meteoritical_code":6,"updttime":72,"reviewed_at":6,"variety_of":6,"varieties":73,"group_members":74,"associates":75,"confused_with":76,"type_localities":77,"occurrence_total":39,"citations":84,"images":93,"structures":104,"synonyms":111,"language_names":113,"wikidata_qid":122,"texts":123},471235,"1:1:471235:6",null,"Dacostaite","Dcs",0,"mineral",11,false,"K(Mg\u003Csub>2\u003C\u002Fsub>Al)[Mg(H\u003Csub>2\u003C\u002Fsub>O)\u003Csub>6\u003C\u002Fsub>]\u003Csub>2\u003C\u002Fsub>(AsO\u003Csub>4\u003C\u002Fsub>)\u003Csub>2\u003C\u002Fsub>F\u003Csub>6\u003C\u002Fsub>·2H\u003Csub>2\u003C\u002Fsub>O",[15,16,17,18,19,20,21],"Al","As","Mg","O","K","F","H",[15,16,17,18,19,20,21],[16],[25],"APPROVED","8","D","G","10","Monoclinic",5,"C2\u002Fm ","12.474","7.198","13.724","99.52",3,6,1,2,"thin, pseudo-hexagonal micaceous crystals up to 0.5 mm in size."," Mohs hardness was not determined owing to the small crystal size; the mineral is probably soft. ","2.162","Silky","Transparent","white","colourless to white",[49,46],"colorless",[46],"Dacostaite is not fluorescent under both short- (λ=254 nm) and long-wavelength (λ=350 nm) UV radiation. ","{001}","Perfect","flexible","Biaxial","-","1.4730",4,"1.4801","1.4805","27","29",1.473,1.4805,"weak","Non-pleochroic","Extinction is parallel or close to parallel to the cleavage plane","genesis is related to the activity of oxidized (Al,F)-rich fluids during the late-stage evolution of the Sb ore deposit"," Type material is deposited in the collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (PI), Italy, catalogue number 20073","New structure type\r\nIt is very rare and is currently present in fewer than 10 known specimens (2025).","The name honours Angelo Da Costa (1940–2022) for his contributions to the field of mineralogy in Tuscany. Angelo Da Costa was a mineral collector active from the beginning of the 1970s up to his death in 2022. He contributed to the exploration of several mineralogical localities, mainly in northern Tuscany (Apuan Alps, Monte Pisano), where he discovered some new mineral occurrences. He collaborated with the Museo di Storia Naturale of the University of Pisa, providing material for mineralogical studies. ","2025-08-11 12:15:25",[],[],[],[],[78],{"id":79,"txt":80,"latitude":81,"longitude":82,"country":83},2164,"Le Cetine di Cotorniano mine, Chiusdino, Siena Province, Tuscany, Italy",43.231978,11.1682997,"Italy",[85,88],{"id":86,"year":6,"html":87,"doi":6},17543268,"Biagioni, C., Mauro, D., Sejkora, J., Dolníček, Z., Dini, A., and Škoda, R.: Dacostaite, IMA 2024-015, in: CNMNC Newsletter 80, Eur. J. Mineral., 36, https:\u002F\u002Fdoi.org\u002F10.5194\u002Fejm-36-599-2024, 2024.",{"id":89,"year":90,"html":91,"doi":92},17942749,2025,"Biagioni, C., Mauro, D., Sejkora, J., Dolnı́ček, Z., Dini, A., Škoda, R. (2025) Dacostaite, K(Mg₂Al)[Mg(H₂O)₆]₂(AsO₄)₂F₆ ⋅2H₂O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy). \u003Ci>European Journal of Mineralogy\u003C\u002Fi>,  37 (1). 39-52 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.5194\u002Fejm-37-39-2025'>doi:10.5194\u002Fejm-37-39-2025\u003C\u002Fa>","10.5194\u002Fejm-37-39-2025",[94],{"id":95,"source_url":96,"license_code":97,"credit_html":98,"title":99,"description":100,"author":101,"original_width":102,"original_height":103},6794,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=158466652","CC BY 4.0","Cristian Biagioni, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=158466652\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Dacostaite.jpg","Dacostaite, thin colourless-to-white crystals associated with sulfur, quartz, gypsum, and a pseudomorphosed cube-octahedral crystal of an unknown phase replaced by a microcrystalline pharmacosiderite-like species. Cetine di Cotorniano Mine, Chiusdino, Siena province, Tuscany, Italy. Holotype specimen: Museo di Storia Naturale of the University of Pisa. Catalogue no. 20073. Photo by Cristian Biagioni.","Cristian Biagioni",2067,1578,[105],{"id":106,"url":107,"label":108,"formula":109,"spacegroup":110,"year":90},3481,"\u002Fcif\u002F3481.cif","Biagioni 2025","K.848 Mg3.32 Al1.68 As2 O22 F6 H28","C 1 2\u002Fm 1",[112],"Dacostaiet",[114,118],{"lang":115,"names":116},"ca",[117],"dacostaïta",{"lang":119,"names":120},"de",[121],"Dacostait","Q129511969",{"history":6,"applications":6}]