- Quartz, Wavellite
- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Small Cabinet, 7.8 x 4.1 x 4.0 cm
Siglo Veinte Mine is one of the most impressive Bolivian localities. It is the type locality for many "best in the world" species, and it even produces some amazing specimens of common species like Quartz. The Japan-Law twin Quartz specimens are well known in the mineral world, and this piece is a great example of said material. The specimen hosts a beautiful, doubly-terminated, nearly water clear, colorless Japan-Law twin Quartz measuring 3.6 cm across along with several prismatic Quartz crystals which are accented by pale yellow color spherical aggregates of Wavellite up to 9 mm.