Ferberite with Marcasite and Arsenopyrite Chalcanthite but it’s definitely different than

but it’s definitely different than typical pieces from Viloco

Specimen # BOL711B47

The terminations on the above specimen are very sharp and lustrous

and certainly different from the typical Cassiterites from Viloco

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

Ferberite with Marcasite and Arsenopyrite Chalcanthite but it’s definitely different thanA 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