TTB46CD4: Group of Chalcopyrite crystals, complex and with polycrystalline growths, with well defined faces and edges and with a very marked bluish iridescence.
After consulting several experts with knowledge of the area, we believe that this piece comes specifically from the Armée Céleste Mine, one of the classic Alsatian mines in which silver was the main metal exploited, and which yielded good specimens of Chalcopyrite.
Sainte-Marie-aux-Mines, Colmar-Ribeauvillé, Haut-Rhin, Grand Est  France

Specimen size: 2.9 × 3.4 × 1.6 cm = 1.14” × 1.34” × 0.63”

Main crystal size: 2.2 × 1.8 cm = 0.87” × 0.71”