[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:470698":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":11,"polytypeof":11,"groupid":11,"weighting":12,"nolocadd":13,"blacklisted":13,"mindat_formula":14,"mindat_formula_note":11,"ima_formula":14,"elements":15,"sigelements":23,"key_elements":24,"impurities":11,"cim":11,"ima_status":25,"ima_notes":11,"ima_history":27,"approval_year":28,"publication_year":11,"discovery_year":11,"strunz10ed1":29,"strunz10ed2":30,"strunz10ed3":31,"strunz10ed4":11,"dana8ed1":11,"dana8ed2":11,"dana8ed3":11,"dana8ed4":11,"csystem":32,"cclass":33,"spacegroup":34,"spacegroupset":35,"a":36,"b":37,"c":38,"alpha":11,"beta":39,"gamma":11,"aerror":40,"berror":41,"cerror":42,"alphaerror":11,"betaerror":33,"gammaerror":11,"va3":11,"z":43,"csmetamict":13,"commentcrystal":11,"twinning":44,"tranglide":11,"parting":45,"epitaxidescription":11,"morphology":11,"tlform":46,"hmin":43,"hmax":11,"hardtype":11,"vhnmin":47,"vhnmax":11,"vhnerror":11,"vhng":48,"vhns":11,"commenthard":11,"dmeas":11,"dmeas2":11,"dcalc":49,"dmeaserror":11,"dcalcerror":11,"commentdense":11,"lustre":11,"lustretype":50,"commentluster":11,"diapheny":11,"streak":51,"colour":52,"commentcolor":11,"colors":53,"streak_colors":54,"luminescence":11,"uv":45,"cleavage":55,"cleavagetype":56,"fracturetype":57,"tenacity":58,"commentbreak":59,"opticaltype":11,"opticalsign":11,"opticalalpha":11,"opticalalpha2":11,"opticalalphaerror":11,"opticalbeta":11,"opticalbeta2":11,"opticalbetaerror":11,"opticalgamma":11,"opticalgamma2":11,"opticalgammaerror":11,"opticalomega":11,"opticalomega2":11,"opticalomegaerror":11,"opticalepsilon":11,"opticalepsilon2":11,"opticalepsilonerror":11,"opticaln":11,"opticaln2":11,"opticalnerror":11,"optical2vcalc":11,"optical2vcalc2":11,"optical2vcalcerror":11,"optical2vmeasured":11,"optical2vmeasured2":11,"optical2vmeasurederror":11,"rimin":11,"rimax":11,"opticaldispersion":11,"opticalpleochroism":11,"opticalpleochorismdesc":11,"opticalbirefringence":11,"opticalcomments":11,"opticalcolour":60,"opticalinternal":45,"opticaltropic":11,"opticalanisotropism":61,"opticalbireflectance":62,"opticalextinction":11,"opticalr":63,"specdispm":11,"ir":11,"electrical":11,"magnetism":11,"thermalbehaviour":11,"other":11,"industrial":11,"occurrence":64,"otheroccurrence":11,"type_specimen_store":65,"description_short":66,"aboutname":67,"rock_parent":11,"rock_parent2":11,"rock_root":9,"rock_bgs_code":11,"meteoritical_code":11,"updttime":68,"reviewed_at":11,"variety_of":11,"varieties":69,"group_members":70,"associates":71,"confused_with":72,"type_localities":73,"occurrence_total":12,"citations":80,"images":89,"structures":90,"synonyms":91,"language_names":93,"wikidata_qid":104,"texts":105},470698,"1:1:470698:0","b54218d5-c3bd-4133-99cc-15d9a11e1817","Letnikovite-(Ce)","Lkv-Ce",0,"mineral",null,1,false,"(Na◻)Ca\u003Csub>2\u003C\u002Fsub>Ce\u003Csub>2\u003C\u002Fsub>[Si\u003Csub>7\u003C\u002Fsub>O\u003Csub>17\u003C\u002Fsub>(OH)]F\u003Csub>4\u003C\u002Fsub>(H\u003Csub>2\u003C\u002Fsub>O)\u003Csub>4\u003C\u002Fsub>",[16,17,18,19,20,21,22],"Ca","Ce","Na","Si","O","F","H",[16,17,18,19,20,21,22],[17],[26],"APPROVED","IMA No. 2022-132",2023,"9","D","N","Monoclinic",5,11,"C2\u002Fm ","7.4726","22.9196","13.9360","105.550",3,9,6,4,"Macroscopically, the crystals do not show twinning, but have \r\nmicroscopic twinning.","none","isolated prismatic grains up to 0.03 x 0.1 mm in a quartz-pectolite aggregate.","239",50,"2.847","Vitreous","white","colorless",[52,51],[51],"{001}","Perfect","Irregular\u002FUneven,Step-Like","brittle","fracture is stepped along the cleavage plane and uneven across this direction","gray","not visible","weak","(4.2,4.7) 470,\r\n(4.3,5.1) 546,\r\n(4.2,5.0) 589,\r\n(4.0,4.8) 650","in a silexite-like peralkaline pegmatite and was formed at a late, probably hydrothermal, stage of the pegmatite.","collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5924\u002F1","New structure type. Chemical combination is somewhat similar to (more complex) semenovite-(Ce).\r\n\r\nThis is the first occurrence of a single [Si^7O^1^7(OH)]#7–# sheet in a mineral.","named for Professor Felix Artem’evich Letnikov (Russian Cyrillic: Феликс Артемьевич Летников) (born October 3, 1934, Polotsk, USSR), Academician of the Russian Academy of Sciences, a prominent geologist working on the petrology and geochemistry of Precambrian rocks.","2026-05-21 07:40:58",[],[],[],[],[74],{"id":75,"txt":76,"latitude":77,"longitude":78,"country":79},3241,"Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan",39.45035,70.716342,"Tajikistan",[81,85],{"id":82,"year":28,"html":83,"doi":84},16143805,"Bosi, Ferdinando, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2023) Newsletter 72. \u003Ci>Mineralogical Magazine\u003C\u002Fi>,  87 (3) 512-518 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1180\u002Fmgm.2023.21'>doi:10.1180\u002Fmgm.2023.21\u003C\u002Fa>","10.1180\u002Fmgm.2023.21",{"id":86,"year":28,"html":87,"doi":88},16880866,"Agakhanov, Atali A., Sokolova, Elena, Cámara, Fernando, Karpenko, Vladimir Yu., Hawthorne, Frank C., Pautov, Leonid A., Kasatkin, Anatoly V., Pekov, Igor V., Agakhanova, Vitaliya A. (2023) Letnikovite-(Ce), (Na□)Ca\u003Csub>2\u003C\u002Fsub>Ce\u003Csub>2\u003C\u002Fsub>[Si\u003Csub>7\u003C\u002Fsub>O\u003Csub>17\u003C\u002Fsub>(OH)]F\u003Csub>4\u003C\u002Fsub>(H\u003Csub>2\u003C\u002Fsub>O)\u003Csub>4,\u003C\u002Fsub> a new mineral from the Darai-Pioz alkaline massif, Tajikistan: mineral description, crystal structure and a new single [Si\u003Csub>7\u003C\u002Fsub>O\u003Csub>17\u003C\u002Fsub>(OH)] sheet. \u003Ci>Mineralogical Magazine\u003C\u002Fi>,  87 (6) 807-818 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1180\u002Fmgm.2023.65'>doi:10.1180\u002Fmgm.2023.65\u003C\u002Fa>","10.1180\u002Fmgm.2023.65",[],[],[92],"Letnikoviet-(Ce)",[94,99],{"lang":95,"names":96},"ca",[97,98],"Letnikovita-","letnikovita-(Ce)",{"lang":100,"names":101},"de",[102,103],"IMA 2022-132","Letnikovit-(Ce)","Q118215180",{"history":11,"applications":11}]