BV1 Sigloite ps. Paravauxite 

Siglo XX Mine, Near Llalagua, Oruro Dept., Bolivia

17.6x 13.7x 2.4 cm

$1500

In 2006, miners at the Siglo XX (translation: Twentieth Century) Mine recovered some of the best paravauxites ever found.  This specimen is on the larger side of those recovered.

In addition to the green paravauxite, there is also sigloite. The two minerals differ chemically by a single water molecule.

These are no longer being found.  A miner had stashed a small quantity of these away, and I purchased them all.