This is a rarely seen species in dealers' stocks. Globular, metallic, lustrous, battleship-gray spheres, to .2 cm across, abound on matrix. This specimen is far more appealing in person, where the luster and sheer number of spheres are evident. It is said to be among the best known specimens of the species, and certainly I can add that it is the ONLY one of any quality I have seen for sale over the years. Ex. Kosnar Collection from their weell-known Bolivian suite, built up over 40 years.