Ferberite (unusual twin!)

Tasna mine, Rosario section of Cerro Tasna, Nor Chichas Province, Potosi Department, Bolivia
Miniature, 5.0 x 3.8 x 3.3 cm
Start Time: 11/19/2009 7:00:00 pm (CST)
End Time: 11/24/2009 7:01:09 pm (CST)
Auction Closed

Item Description

A very unusual and completely unique, stacked/layered, multi-twinned crystal of Ferberite from the renowned Tasna mine in southern Bolivia. The piece was mined at the beginning of 2008, which is encouraging because I have seen VERY little in the way of Ferberites from this mine in recent years. Ferberite 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. It is a superb quailty, sharp, lustrous, jet-black twinned crystal with several smaller secondary crystals running parallel to the main twinned crystal. It has an attractive form, and is a wonderful example of how bizzare the twins from this mine can get. Twinned crystals from Bolivia are becoming increasingly difficult to obtain in recent years as the price of Tungsten ore has driven the miners to throw nearly all the Ferberite into the crusher, causing thousands of specimens to be lost forever. These twins are definitely the most highly sought after crystal habit from this locality. This piece is one of the most unique and interesting Ferberite twins that I have offered in a while. Valued at $1200 in the inventory, and well worth for the uniqueness and quality.

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