An EXCEPTIONALLY FORMED, 3-dimensional BISBEE copper with a great patina. This CABINET-SIZED piece consists of two nearly perpendicular connected plates (spinel twins?) with arborescent to dentritic copper crystal clusters. The large copper crystals are tetrahexahedrons. This old-timer was in the collection of respected Texas collector, Dr. HM Brennecke and the Bisbee location was confirmed by noted Arizona collector/ dealer Evan Jones. Excellent Bisbee coppers are very uncommon, they just were not preserved. 10.0 x 5.7 x 5.0 cm