Crystals of hübnerite, a mineral of the wolframite group, of which it is the manganese pole. A selection of specimens of this crystallized mineral species. Hübnerite is a mineral, and here you’ll find a number of collector’s items presented with a description, one or more photos and sometimes a video. These hübnerites are for sale. Wolframite was formerly known as “wolfram”. It is a manganese tungstate, chemical formula MnWO₄, monoclinic crystal system.