- Paravauxite, Sigloite
- Cabinet, 10.3 x 8.7 x 7.5 cm
- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
This remarkably attractive specimen features beautiful 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 up to 9 mm. This specimen is from the type locality for both species. Mark Chance Bandy described Paravauxite crystals in his book "Mineralogy of Llallagua, Bolivia." This piece is a great example of the prismatic, sheaf-like parallel growths that Mr. Bandy described.