Siglo XX mine, Llallagua, Bustillo Province, Potosi Department, Bolivia - This piece features dozens of superb, incredibly rare, sharp, lustrous light green crystals of Paravauxite measuring up to 7 mm with tan colored crystals of Sigloite on iron-stained Wavellite on matrix. Sigloite forms as the result of alteration from Paravauxite. This specimen is from the type locality for both species ! This piece is a great example of the prismatic, sheaf-like parallel growths that are described on every mineralogy book on Bolivian minerals.Overall size is 7.8 x 6.5 x 2.3 cm