Paravauxite, Sigloite
Small Cabinet, 5.8 x 4.2 x 2.7 cm
Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
This remarkably large specimen features an attractive group of lustrous, water-green color Paravauxite crystals and some minor tan color Sigloite crystals associated with micro crystallized iron-stained Wavellite needles on matrix. Sigloite forms as an alteration of Paravauxite. The largest Paravauxite crystal measures 0.7 cm. This specimen is from the type locality for both species. Mark Chance Bandy described Paravauxite crystals in his book "Mineralogy of Llallagua, Bolivia." He states that Paravauxite is the most abundant of all the "Vauxites" from this mine " This piece is a great example of the prismatic, sheaf-like parallel growths that Mr. Bandy described. From the Contaco Vein.