- Chalcocite, Bornite
- Thumbnail, 1.8 x 1.6 x 1.6 cm
- Botallack Mine, Botallack, Botallack - Pendeen Area, St Just District, Cornwall, England, UK
An aesthetic, old-time combination thumbnail from the historic Botallack Mine of Cornwall, England. Two disc-like, matte-gray, six-sided, bi-pyramidal chalcocite crystals are exquisitely perched on two intergrown, tabular bornite crystals. The Botallack Mine opened in 1721 and closed in 1914.