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Forms include {001}, {110}, {100}, {101}, {104}, {012}, {021}, {267}.","Crystals (isometric to thick-tabular) and grains to 2-2.5 cm.",5.5,"2.87","2.869","Vitreous.","Vitreous","Translucent","Brownish","Dark brown",[61,62],"brown","gray",[61],"Nonfluorescent.","Not fluorescent.","Perfect on {0001}.","Perfect","Irregular\u002FUneven,Step-Like","brittle","Uniaxial","-","1.620","1.616",1.616,1.62,"Non-pleochroic","In a pegmatoid cancrinite syenite vein.","A. E. Fersman Mineralogical Museum, Moscow, Russia.","Eudialyte Group.\r\n\r\nDistinguished from eudialyte sensu stricto by ordering of Ca (at M1 and Na4 sites), dominance of ferric iron and niobium (at M3 site, located in the centre of ninefold ring). Other group members with essential Fe3+ are fengchengite,...","Named in honor of Vladimir Georgievich Feklichev (Владимир Георгиевич Фекличев) (30 June 1933 - 1999), Russian petrologist, mineralogist and crystallographer.","2025-08-11 12:14:32",[],[84,93,99,106,114,120,127,134,140,147,154,162,169,175,182,189,197,203,208,214,222,228,236,243,250,257,264,270,279,284,289],{"id":85,"name":86,"entrytype":9,"csystem":40,"ima_formula":87,"mindat_formula":88,"hmin":89,"hmax":90,"dmeas":91,"dcalc":92,"primary_image_id":11},141,"Alluaivite","Na\u003Csub>19\u003C\u002Fsub>(Ca,Mn\u003Csup>2+\u003C\u002Fsup>)\u003Csub>6\u003C\u002Fsub>(Ti,Nb)\u003Csub>3\u003C\u002Fsub>Si\u003Csub>26\u003C\u002Fsub>O\u003Csub>74\u003C\u002Fsub>Cl &middot; 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&middot; H\u003Csub>2\u003C\u002Fsub>O","Na\u003Csub>15\u003C\u002Fsub>(Na,Ca,Ce)\u003Csub>3\u003C\u002Fsub>(Mn,Ca)\u003Csub>3\u003C\u002Fsub>Fe\u003Csub>3\u003C\u002Fsub>Zr\u003Csub>3\u003C\u002Fsub>Si\u003Csub>26\u003C\u002Fsub>O\u003Csub>72\u003C\u002Fsub>(OH,O)\u003Csub>4\u003C\u002Fsub>Cl&middot;H\u003Csub>2\u003C\u002Fsub>O",{"id":290,"name":291,"entrytype":9,"csystem":40,"ima_formula":292,"mindat_formula":293,"hmin":89,"hmax":89,"dmeas":294,"dcalc":46,"primary_image_id":295},25675,"Zirsilite-(Ce)","(Na,&#9723;)\u003Csub>12\u003C\u002Fsub>(Ce,Na)\u003Csub>3\u003C\u002Fsub>Ca\u003Csub>6\u003C\u002Fsub>Mn\u003Csub>3\u003C\u002Fsub>Zr\u003Csub>3\u003C\u002Fsub>NbSi\u003Csub>25\u003C\u002Fsub>O\u003Csub>73\u003C\u002Fsub>(OH)\u003Csub>3\u003C\u002Fsub>(CO\u003Csub>3\u003C\u002Fsub>) &middot; H\u003Csub>2\u003C\u002Fsub>O","Na\u003Csub>11-12\u003C\u002Fsub>(Ce,Na)\u003Csub>3\u003C\u002Fsub>Ca\u003Csub>6\u003C\u002Fsub>Mn\u003Csub>3\u003C\u002Fsub>Zr\u003Csub>3\u003C\u002Fsub>Nb(Si\u003Csub>19\u003C\u002Fsub>O\u003Csub>55\u003C\u002Fsub>)(Si\u003Csub>3\u003C\u002Fsub>O\u003Csub>9\u003C\u002Fsub>)\u003Csub>2\u003C\u002Fsub>(CO\u003Csub>3\u003C\u002Fsub>)(OH)\u003Csub>3\u003C\u002Fsub>&middot;H\u003Csub>2\u003C\u002Fsub>O","3.15",28873,[],[],[299],{"id":300,"txt":301,"latitude":302,"longitude":303,"country":304},30390,"Kovdor Phlogopite mine, Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia",67.5891667,30.4591667,"Russia",[306,309,314,317,322,326,331],{"id":307,"year":32,"html":308,"doi":11},16132958,"Pekov, I.V., Ekimenkova, I.A., Chukanov, N.V., Rastsvetaeva, R.K., Kononkova, N.N., Pekova, N.A., Zadov, А.Е. (2001) Feklichevite Nа\u003Csub>11\u003C\u002Fsub>Са\u003Csub>9\u003C\u002Fsub>(Fе\u003Csup>3+\u003C\u002Fsup>,Fе\u003Csup>2+\u003C\u002Fsup>)\u003Csub>2\u003C\u002Fsub>Zr\u003Csub>3\u003C\u002Fsub>NЬ[Si\u003Csub>25\u003C\u002Fsub>O\u003Csub>79\u003C\u002Fsub>](ОН,Н\u003Csub>2\u003C\u002Fsub>O,Сl,O)\u003Csub>5\u003C\u002Fsub>, a new mineral of the eudialyte group from Kovdor massif, Kola Peninsula. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 130(3): 55-65.",{"id":310,"year":311,"html":312,"doi":313},63724,2002,"Mandarino, Joseph A. (2002) New minerals. \u003Ci>The Canadian Mineralogist\u003C\u002Fi>,  40 (5). 1527-1550 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2113\u002Fgscanmin.40.5.1529'>doi:10.2113\u002Fgscanmin.40.5.1529\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Fdoclib\u002Fcm\u002Fvol40\u002FCM40_1529.pdf' class='refpdflink'>\u003C\u002Fa>","10.2113\u002Fgscanmin.40.5.1529",{"id":315,"year":311,"html":316,"doi":11},17477386,"Jambor, John L., Roberts, Andrew C. (2002) New mineral names. \u003Ci>American Mineralogist\u003C\u002Fi>,  87 (11) 1731-1735 \u003Ca target='_blank' href='http:\u002F\u002Fwww.minsocam.org\u002FMSA\u002FAmMin\u002FTOC\u002FAbstracts\u002F2002_Abstracts\u002FND02_Abstracts\u002FJambor_p1731_02.pdf' class='refpdflink'>\u003C\u002Fa>",{"id":318,"year":319,"html":320,"doi":321},63822,2003,"Johnsen, O., Ferraris, G., Gault, R. A., Grice, J. D., Kampf, A. R., Pekov, I. V. (2003) The nomenclature of eudialyte-group minerals. \u003Ci>The Canadian Mineralogist\u003C\u002Fi>,  41 (3) 785-794 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2113\u002Fgscanmin.41.3.785'>doi:10.2113\u002Fgscanmin.41.3.785\u003C\u002Fa> \u003Ca target='_blank' href='https:\u002F\u002Frruff.info\u002Fdoclib\u002Fcm\u002Fvol41\u002FCM41_785.pdf' class='refpdflink'>\u003C\u002Fa>","10.2113\u002Fgscanmin.41.3.785",{"id":323,"year":324,"html":325,"doi":11},15960814,2007,"Khomyakov, A.P., Nechelyustov, G.N., Rastsvetaeva, R.K. (2007): Aqualite, (H3O)8(Na,K,Sr)5Ca6Zr3Si26O66(OH)9Cl, a new eudialyte-group mineral from Inagli alkaline massif (Sakha-Yakutia,Russia),and the problem of oxonium in hydrated eudialytes. Proceedings of the Russian Mineralogical Society (Zapiski RMO), 136(2), 39-55.",{"id":327,"year":328,"html":329,"doi":330},19684,2012,"Rastsvetaeva, R. K., Chukanov, N. V. (2012) Classification of eudialyte-group minerals. \u003Ci>Geology of Ore Deposits\u003C\u002Fi>,  54 (7) 487-497 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.1134\u002Fs1075701512070069'>doi:10.1134\u002Fs1075701512070069\u003C\u002Fa>","10.1134\u002Fs1075701512070069",{"id":332,"year":333,"html":334,"doi":11},16964220,2021,"(2021) Feklichevite. \u003Ci>Handbook of Mineralogy\u003C\u002Fi>. Mineralogical Society of America \u003Ca target='_blank' href='https:\u002F\u002Fwww.handbookofmineralogy.org\u002Fpdfs\u002FFeklichevite.pdf' class='refpdflink'>\u003C\u002Fa>",[],[],[338,339],"Feklicheviet","IMA2000-017",[341,345,350,354,357],{"lang":342,"names":343},"ca",[344],"feklichevita",{"lang":346,"names":347},"de",[348,349],"Feklichevit","IMA 2000-017",{"lang":351,"names":352},"eu",[353,7],"Feklichevita",{"lang":355,"names":356},"it",[7],{"lang":358,"names":359},"mk",[360],"Фекличевит","Q3742064",{"history":11,"applications":11}]