Introduction: wolframite forms typically in (i) high to medium temperature quartz-rich veins in greisen, or in pegmatites associated with granitic intrusive rocks; (ii) in high-temperature hydrothermal ('hypothermal') veins associated with cassiterite, arsenopyrite, apatite, tourmaline, topaz, fluorite, specular hematite, molybdenite, and bismuth; (iii) in mesothermal veins, with cassiterite and sulphides, scheelite, bismuthinite, and siderite.

Occurrence in Wales: Colman and Appleby (1991) tentatively reported wolframite (based on the presence of tungsten during electron microprobe analysis), occurring as small grains associated with cassiterite as inclusions, in magnetite within breccia from Shadow Gully. High levels of tungsten were also proved during XRF scans of milled samples of quartz-magnetite veins, derived from Cwm Tregalan. Bevins & Mason (1998), however, describe scheelite developed between magnetite grains within the Shadow Gully breccia. The presence of scheelite explains the high levels of tungsten recorded by Colman & Appleby (1991) suggesting, that wolframite may not actually be present.

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