Excerpt - page 83: "... and a silicate phase containing the iron, manganese, and calcium oxide con- stituents. The halide tungstate phase contains 99% of the tungsten content in the ore concentrate. ..."
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Excerpt - page 71: "... group. Heteronuclear sulfido clusters which have iron and vanadium, chromium, manganese, or tungsten are known. The vanadium compound (C5H4Me)2V2Fe(CO)3(µ-S)(µ3-S)2 (229) arises from the ..."