- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Miniature, 3.2 x 3.2 x 1.8 cm
A beautiful and remarkable vauxite specimen with great blue color, an unusual cornflower blue. The translucent and lustrous crystals are well formed and are in extremely rare radial aggregates on clay matrix. Vauxite is a very rare phosphate. This specimen has excellent color, form and is very rich. It's a stellar example of colorful vauxite of an unusual and rare variety. Ex. Tarnowski Collection.