- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Miniature, 3.5 x 2.5 x 1.4 cm
Here we have a remarkable, very well crystallized, rich blue color, ridiculously rare specimen consisting of radiating crystal aggregates of Vauxite. It is very difficult to obtain any specimens of this incredibly beautiful phosphate. 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 so unbelievably rare to find matrix specimens of Vauxite from Bolivia. It is very difficult to obtain Vauxite specimens with such rich color that are not coated by micro Quartz nor have a dull grey overtone. Ex. Richard Kosnar Collection.