Paravauxite, Sigloite
Small Cabinet, 6.0 x 6.0 x 2.6 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 (which forms as an alteration of Paravauxite) crystals associated with micro crystallized iron-stained Wavellite needles on matrix. The largest Paravauxite group is a lovely "bow tie"-shaped aggregate measuring 2.0 cm across. 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.