FerberiteAn impressive and attractive twinned Ferberite from Tasna. 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 splendid piece is a sharp, highly lustrous, jet black twinned crystal of Ferberite (twinned along the a{100} face). For a final aesthetic touch, one can see a sparkling spherical aggregate of Marcasite on the

sharpness and translucency/gemminess sitting on Pyrite and Limonite matrix

the small amount of damage is forgivable

The quality is excellent for the species

Specimen # BOL711B24

Specimen # BOL711B123

and I have only seen a scattered few of them on the market since that time

There are three aspects to this specimen that make it stand out from so many others on the market

AND the fact that the crystals are on matrix

This species belongs to the only group of minerals that forms in naturally "round" or "cylindrical" shaped crystals

arborescent group of crudely crystallized Copper is a great display specimen from this historic locality

the piece is in great shape

there are a few partial blades of Brookite on the piece which are not fully terminated