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MD-210565
Paravauxite, Sigloite
Miniature, 3.6 x 3.3 x 1.7 cm
Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
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This piece features superb, rare, sharp, sparkling, lustrous, light green crystals of Paravauxite with tan colored crystal of Sigloite on iron-stained Wavellite on matrix. The largest crystal measures 0.5 cm. Sigloite forms as the result of alteration from Paravauxite. 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," and with that said, you almost never see specimens, especially pieces that are larger than thumbnails available on the market. This piece is a fine example of the prismatic, sheaf-like parallel growths that Mr. Bandy described.