Prehnite brown I have photographed the crystals

I have photographed the crystals under the microscope to better illustrate their quality

Though lustrous and gemmy

I don't have to tell you that the value of Tsumeb specimens seems to rise daily

It has been said that gamma spectroscopic data indicates that this brilliant color is possibly attributed to the presence of uranium in the form of a uranyl (UO2 2+) molecule

Prehnite brown I have photographed the crystalsOne of the most unusual Prehnites I have seen from any locality. At first glance, one might think that these are "casts" or epimorphs after another species, as Prehnite has been known to do, but upon close inspection you can see that these are completely solid inside and are basically Prehnite stalactites or non epimorphic "fingers". Some of these "fingers" are broken and show a radial growth pattern in the center. Really strange for the species. I