Ferberite doubly terminated On the micro level

On the micro level

the crystals are included with an unknown blackish mineral (probably Jamesonite) to create an eye-catching two-toned effect

antimony sulfosalt which are associated with rare lustrous acicular Zinkenite crystals on matrix

but instead was potentially a pen name for works written by Johann Thölde

You can see his photo mining at the Sweet Home on page 58 of Peter Bancroft's book "Gem and Crystal Treasures"

Ferberite doubly terminated On the micro levelA fantastic and hefty, twinned Ferberite specimen from the famous Tasna mine in Bolivia. This mine is probably best known for its Ferberites, and its because of twins like this. As a species, Ferberite is rarely found in twinned crystals, most often as blades. This impressive and attractive twin has wonderful blocky form with very sharp faces, excellent luster and very little in the way of damage. Its incomplete on the back where it came off the