- Miniature, 3.6 x 2.2 x 1.9 cm
- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
Here we have an attractive, very well crystallized, very rare specimen consisting of beautiful blue color, radiating crystal aggregates of Vauxite on white Wavellite on matrix. This piece is from the type locality for this material which was discovered along the Contacto and San Jose veins in this mine and was first described by Sam Gordon and Mark Bandy. It is unbelievably rare to find matrix specimens of Vauxite.