. "\u0160koda, Radek" . . . "6"^^ . "RIV/00216224:14310/14:00075388" . "14310" . "6"^^ . "Nb-Ta oxide minerals in alluvial placers from Kamakwie, NW Sierra Leone: compositional variations and evolutionary trend" . "N" . . "columbite-tantalite; pegmatite; alluvial placers; Sierra Leone; \u201Cfingerprinting\u201D"@en . "\u010Copjakov\u00E1, Renata" . . . "[94FCA00024FE]" . "Nb-Ta oxide minerals in alluvial placers from Kamakwie, NW Sierra Leone: compositional variations and evolutionary trend"@en . . . "Columbite-tantalite group minerals are extensively mined from alluvial placers near Kamakwie, Sierra Leone. Chemical composition and evolutionary trend of these minerals are presented. This extreme composition may be useful, along with trace elements variability and geochronological information, for the \u201Efingerprinting\u201C of Ta ores."@en . . "Nov\u00E1k, Milan" . . "Columbite-tantalite group minerals are extensively mined from alluvial placers near Kamakwie, Sierra Leone. Chemical composition and evolutionary trend of these minerals are presented. This extreme composition may be useful, along with trace elements variability and geochronological information, for the \u201Efingerprinting\u201C of Ta ores." . . . "Nb-Ta oxide minerals in alluvial placers from Kamakwie, NW Sierra Leone: compositional variations and evolutionary trend" . "Va\u0161inov\u00E1 Galiov\u00E1, Michaela" . "Proke\u0161, Lubom\u00EDr" . . "Nb-Ta oxide minerals in alluvial placers from Kamakwie, NW Sierra Leone: compositional variations and evolutionary trend"@en . . "RIV/00216224:14310/14:00075388!RIV15-MSM-14310___" . . . "31897" . . . . "Loun, Jan" . . .