- Paravauxite, Sigloite, Wavellite
- Small Cabinet, 8.4 x 4.3 x 3.7 cm
- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
This remarkably attractive specimen features beautiful, water-green color Paravauxite crystals and some minor tan color Sigloite crystals associated on matrix. The reverse side of the specimen features several spherical Wavellite aggregates with Quartz. Sigloite forms as an alteration of Paravauxite. The largest Paravauxite crystal measures up to 9 mm. This specimen is from the type locality for both Paravauxite and Sigloite. 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.