Fig. 7

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Habitus de la qitianlingite. (a) Cartographie élémentaire au MEB montrant les cristaux mixtes de qitianlingite-manganocolumbite (violets), wolframite (blanc-gris) et scheelite (gris sombre avec les impacts de laser pour datation ICPMS) ; (b) Cartographie élémentaire au MEB du grand cristal de qitianlingite-manganocolumbite visible sur (a) et montrant la répartition du niobium. Les zones riches en Nb (rouge à jaune) correspondent à la manganocolumbite, les zones pauvres (bleu et vert) à la qitianlingite ; (c) Idem (b), montrant la répartition du tungstène. Les zones enrichies en W (vert) correspondent à la qitianlingite, les zones appauvries et dépourvues de W (bleu à violacé) à la manganocolumbite. Les zones très riches, rouges et orangées, sont de la wolframite.
Qitianlingite habits. (a) MEB mapping (BSE) showing mixed crystals of qitianlingite-manganocolumbite (purple), wolframite (grey-white) and scheelite (dark grey with ICPMS laser impacts); (b) MEB mapping (BSE) made on the huge qitianlingite-manganocolumbite mixed crystal visible on (a) and showing niobium distribution. Nb-rich zones (red to yellow) is manganocolumbite, Nb-depleted zones (blue and green) is qitianlingite; (c) Idem (b), showing tungsten distribution. W-rich zones (green) is qitianlingite, W-depleted zones (blue to purplish) is manganocolumbite. Very-rich zones (red and orange) are wolframite.
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