NC57AM4: Bornite crystals pseudomorphic after Chalcocite twins, with a bronze color, with tetrahedral crystals of Tennantite-(Fe) and twins of Chalcocite that are shiny and have bluish metallic tones. The specimen comes from the last find before the definitive closure of open-pit mining here, and this is the first time that collector quality Bornite has appeared at this locality.
This material has been analyzed and we will send a copy of the analysis to the buyer.
The specimen has been reviewed, photographed and published as a new discovery in the magazine ‘Mineralogical Record’ on page 206 in the volume 52, number 2, March-April 2021
Las Cruces Mine, fase 6, levels 130-135, ↓175 m., Gerena-Guillena-Salteras, Comarca Sierra Norte, Seville, Andalusia  Spain (01/2020)

Specimen size: 7.4 × 6.6 × 5 cm = 2.91” × 2.60” × 1.97”

Main crystal size: 0.7 × 0.3 cm = 0.28” × 0.12”