Ferberite with Marcasite and Arsenopyrite Chalcanthite The terminations on the above

The terminations on the above specimen are very sharp and lustrous

This is a wonderful opportunity to own a good reference specimen of this extraordinarily rare mineral species

I like to call them “black beauties”) is the fact that they’re not always terribly aesthetic

Only a very small percentage of the Augelites from Machacamarca are found in twinned crystals

Ferberite with Marcasite and Arsenopyrite Chalcanthite The terminations on the aboveA wonderfully well crystallized, and eye catching closed twin of Ferberite with great form, sharpness and luster is coated by spherical aggregates of pale golden Marcasite and minor grey Arsenopyrite. The piece is virtually undamaged on the display side and when propped up, the piece displays beautifully. Good Bolivian Ferberites are not often found with any associated minerals, especially with any kind of aesthetic appeal like this one. Its a great