Crystals of wolframite, including ferberite, a selection of specimens of this crystallized mineral species. Wolframite is a mineral, here many collectibles presented with a description, one or more photos and sometimes a video. These wolframites are for sale. It is a group of minerals formed from tungsten oxide, which includes ferberite FeWO₄ and hübnerite MnWO₄, monoclinic crystal system.