Cassiterite on QuartzThis particular piece is a superb quality Cassiterite from the standpoint of luster, sharpness and the fact that there are TWO distinct twinning habits on the same specimen. An impressive, classic, sharp, lustrous group of black to gemmy golden color cyclic twinned crystals sit atop prismatic white Quartz matrix. The most interesting aspect of the piece is the fact that there are a few RARELY seen drillbit habit twinned groups. Its not common to find

"sheet" of Copper is a great display specimen from this historic locality

I've only seen a few of these over the years

The crystals are associated with minor Quartz and Pyrrhotite on the reverse side of the specimen

The Monazites are some of the most distinct and impressive twinned crystals I have seen from Bolivia and they actually perform a color change in different lighting ranging from orange-pink to a white/yellow depending upon the light source

Specimen # BOL711B161

Specimen # BOL711B171

I still consider this to be a collector quality specimen

Augelite is not seen often in any format from any locality

save the tiniest of “Wilbers” on the edge

This specimen has fine

The main crystal on this specimen has a rarely seen golden-brown color

I personally acquired the entire lot of ALL the top crystals that came into the U