WOLFRAMITE (FERBERITE), Mine de Tasna, BOLIVIE (petite armoire)
La ferbérite est le pôle riche en fer de la série des solutions solides manganèse-fer- wolframite , l'hübnérite représentant le pôle manganèse. Ce minéral noir monoclinique est principalement composé de tungstate de fer(II), ou FeWO₄. La ferbérite et l'hübnérite contiennent généralement des cations divalents de fer et de manganèse, la wolframite constituant l'espèce intermédiaire de la série. La ferbérite se présente sous forme de granules et de cristaux prismatiques allongés, avec une dureté Mohs de 4,5 et une densité comprise entre 7,4 et 7,5. On la trouve couramment dans les pegmatites, les greisens granitiques et les gisements hydrothermaux de haute température, et elle est considérée comme un minerai de tungstène mineur. Découverte en 1863 dans la Sierra Almagrera, en Espagne, la ferbérite doit son nom au minéralogiste allemand Moritz Rudolph Ferber.
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