"CA - Kanada" . . "Nov\u00E1k, Milan" . "[5DEBAA1D530A]" . "Ferrotapiolit jako pseudomorf\u00F3za po stibiotantalitu z lepidolitov\u00E9ho pegmatitu v La\u0161tovi\u010Dk\u00E1ch, p\u0159\u00EDklad hydroterm\u00E1ln\u00ED alterace v stabiln\u00EDm Ta/(Ta+Nb)"@cs . . "Filip, Jan" . "Ferrotapiolite as a pseudomorph of stibiotantalite from the La\u0161tovi\u010Dky lepidolite pegmatite; Czech Republic; an example of hydrothermal alteration at constant Ta/(Ta+Nb)"@en . "Ferrotapiolite as a pseudomorph of stibiotantalite from the La\u0161tovi\u010Dky lepidolite pegmatite, Czech Republic; an example of hydrothermal alteration at constant Ta/(Ta+Nb)"@en . . . . . "Ferrotapiolite as a pseudomorph of stibiotantalite from the La\u0161tovi\u010Dky lepidolite pegmatite, Czech Republic; an example of hydrothermal alteration at constant Ta/(Ta+Nb)"@en . "Canadian Mineralogist" . "Ferrotapiolite as a pseudomorph of stibiotantalite from the La\u0161tovi\u010Dky lepidolite pegmatite, Czech Republic; an example of hydrothermal alteration at constant Ta/(Ta+Nb)" . "Dark brown porous ferrotapiolite is a dominant alteration product in pseudomorphs after primary stibiotantalite from the lepidolite pegmatite at La\u0161tovi\u010Dky, western Moravia, Czech Republic. Two compositionally distinct varieties of ferrotapiolite were recognized a volumetrically dominant Fe3+-rich phase and a very rare Sb-rich phase. Niobium-rich ferrotapiolite, with up to 17.51 wt.% Nb2O5 (0.61 apfu), is highly heterogeneous with Ta/(Ta+Nb) of 0.69 to 0.84 and Mn/(Mn+Fe) of 0.01 to 0.05; Fe2O3calc. 3.09 wt.% (0.18 Fe3+ apfu; ~ 0.16 to 0.22 Fe3+ apfu from M\u00F6ssbauer spectroscopy) in the ferrian, and Sb2O3 9.87 wt.% (0.34 Sb3+ apfu) in antimonoan variety. The unit-cell dimensions of ferrian ferrotapiolite a = 4.746-4.757 \u00C5 and c = 9.198-9.244 \u00C5 calculated from X-ray powder diffraction data indicate highly variable degrees of structural order. The substitution NbTa-1 is dominant; the minor substitution Fe3+3Fe2+-2R5+-1 typical of the ferrian ferrotapiolite strongly suggests incorporation of Fe3+ into the" . . . "5"^^ . . "564307" . "RIV/00216224:14310/04:00011197" . . "Dark brown porous ferrotapiolite is a dominant alteration product in pseudomorphs after primary stibiotantalite from the lepidolite pegmatite at La\u0161tovi\u010Dky, western Moravia, Czech Republic. Two compositionally distinct varieties of ferrotapiolite were recognized a volumetrically dominant Fe3+-rich phase and a very rare Sb-rich phase. Niobium-rich ferrotapiolite, with up to 17.51 wt.% Nb2O5 (0.61 apfu), is highly heterogeneous with Ta/(Ta+Nb) of 0.69 to 0.84 and Mn/(Mn+Fe) of 0.01 to 0.05; Fe2O3calc. 3.09 wt.% (0.18 Fe3+ apfu; ~ 0.16 to 0.22 Fe3+ apfu from M\u00F6ssbauer spectroscopy) in the ferrian, and Sb2O3 9.87 wt.% (0.34 Sb3+ apfu) in antimonoan variety. The unit-cell dimensions of ferrian ferrotapiolite a = 4.746-4.757 \u00C5 and c = 9.198-9.244 \u00C5 calculated from X-ray powder diffraction data indicate highly variable degrees of structural order. The substitution NbTa-1 is dominant; the minor substitution Fe3+3Fe2+-2R5+-1 typical of the ferrian ferrotapiolite strongly suggests incorporation of Fe3+ into the"@en . . . "4" . "0008-4476" . "42" . . "000224260900015" . "12"^^ . "3"^^ . "Ferrotapiolit jako pseudomorf\u00F3za po stibiotantalitu z lepidolitov\u00E9ho pegmatitu v La\u0161tovi\u010Dk\u00E1ch, p\u0159\u00EDklad hydroterm\u00E1ln\u00ED alterace v stabiln\u00EDm Ta/(Ta+Nb)"@cs . "\u0160rein, Vladim\u00EDr" . "Cemp\u00EDrek, Jan" . . "\u010Cern\u00FD, Petr" . . . "14310" . . "RIV/00216224:14310/04:00011197!RIV09-AV0-14310___" . . "Ferrotapiolite as a pseudomorph of stibiotantalite from the La\u0161tovi\u010Dky lepidolite pegmatite, Czech Republic; an example of hydrothermal alteration at constant Ta/(Ta+Nb)" . "Ferrotapiolit jako pseudomorf\u00F3za po stibiotantalitu z lepidolitov\u00E9ho pegmatitu v La\u0161tovi\u010Dk\u00E1ch, p\u0159\u00EDklad hydroterm\u00E1ln\u00ED alterace v stabiln\u00EDm Ta/(Ta+Nb), p\u0159i alteraci nedoch\u00E1z\u00ED ke zm\u011Bn\u011B Ta a Nb"@cs . "P(IAA3046002), P(RK99P03OMG014)" .