Group of paravauxite and some sigloite crystals partially covering the rocky matrix. This specimen contain both paravauxite and sigloite, which differ chemically by the presence of a single water molecule. In this specimen paravauxite is a little bit more transparent and with a delicate yellow to bluish color, sigloite is more white and less transparent. The Siglo XX Mine is the type locality for sigloite species. THE MAIN CRYSTAL IS: 0.9 x 0.4 x 0.1 cm.