Here is a very good quality twinned crystal of Ferberite on matrix. This species was sometimes previously referred to as "Wolframite," which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited. This piece features the classic, "butterfly" twinning of Ferberite along the a (100) face. This piece is a sharp, lustrous, aesthetic jet-black twinned crystal measuring 2.5 cm on a Quartz and Arsenopyrite matrix. This piece is displayable from several angles. There are actually two more twins on the lower portion of this specimen, and they are both complete! Twinned crystals from Bolivia have becoming increasingly difficult to obtain from Bolivia, and MATRIX specimens are virtually impossible to find! These are definitely the most highly sought after crystal habit from this locality This piece one of the most well-formed Ferberite twins that I have seen from Bolivia, and the fact that its on matrix make its highly desirable. 9.3 x 5.5 x 4.0cm