- Vauxite, Quartz
- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Miniature, 4.1 x 2.9 x 1.4 cm
From the new find of 2007, this is another great discovery for this locality. This particular piece is a remarkable, very well crystallized, rare, specimen consisting of small, bladed, beautiful blue color, radiating aggregates of Vauxite coated by with a sugary "wash" of Quartz on minor clay (probably decomposed Allophane) matrix. This piece is from the type locality for Vauxite which was originally discovered along the Contacto and San Jose veins in this mine and first described by Sam Gordon and Mark Bandy.