NW16AL4: Very sharp Chalcocite crystals that form hexagonal cyclic twins with well defined faces and edges, flattened, shiny, on matrix. The specimen has been analyzed and we will send a copy of the analysis to the buyer.
This specimen has been published on the Mineralogical Record´s web page, in the ‘What's New’ section, report 56, June 6, 2020 edition, page 2
Las Cruces Mine, Gerena-Guillena-Salteras, Comarca Sierra Norte, Seville, Andalusia  Spain

Specimen size: 3.1 × 2.1 × 0.7 cm = 1.22” × 0.83” × 0.28”

Main crystal size: 0.4 × 0.2 cm = 0.16” × 0.08”