TB46AD0: A novelty at Tucson 2016 (but found in 2013). Complex Pyrite crystal, very rich in faces that are black colored due to a uniform Chalcocite coating, very bright and on matrix, with small (not coated) Pyrite crystals.
This specimen has been reviewed and published in the special "Milpillas" of the magazine ‘Lapis’ number 07-08/2017, page 26
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora  Mexico (2013)

Specimen size: 8.4 × 5.7 × 4.8 cm = 3.31” × 2.24” × 1.89”

Main crystal size: 2.1 × 1.6 cm = 0.83” × 0.63”