Ferberite (rare doubly terminated twin) on matrix! Dave Bergman but in great shape on

but in great shape on the display side

This attractive specimen features beautiful lustrous

Here is a great old locality specimen of Vivianite from the Siglo XX mine in Bolivia

antimony sulfosalt

Very little damage

Ferberite (rare doubly terminated twin) on matrix! Dave Bergman but in great shape onA VERY rarely seen Ferberite twin on matrix from Tasna. Often, the Ferberites from Tasna are not found on matrix as they are heavy in nature and the brittleness of the species causes it to fall off the host rock in the blast during mining operations. This specimen is not only an impressive, and dramatically aesthetic matrix piece, but the Ferberite twin is DOUBLY TERMINATED, which is only seen in a very small percentage of pieces from Tasna. I