Grandon Pocket, Pederneira Mine, São José da Safira, Minas Gerais, Brazil
20.3 cm tall x 19 cm wide
Ex-collection Keith Proctor
The Pederneira Mine has produced numerous colorful tourmaline specimens on finely crystallized matrix. This mine is considered among the most significant in the world for collector quality tourmaline on matrix. The Grandon Pocket was named after a single specimen, the largest piece ever found: the Grandon or The Big Boss. It is currently the centerpiece in the Houston Museum of Natural Science in Texas.
This tourmaline was found next to Grandon and is similar in appearance: gem-quality tourmaline crystals with intense bluish green color shooting out of water clear quartz. The bright green tourmalines, clear quartz, and white cleavelandite create a tour-de-force of contrasting colors.
This piece was pictured in The Mineralogical Record in January 2015.