EMT27ASN1: A classic example of American mineralogy. Very bright skeletal and hoppered crystals of Chalcopyrite with a vivid and intense golden color, slightly iridescent with very marked triangular shapes, accompanied by small Pyrite crystals.
A true 'oldie' from mines that operated from the first half of the 18th century until the mid-20th century, and from which specimens were recovered from their waste piles until 1989, when collection was prohibited.
French Creek Mines, St. Peters, Warwick Township, Chester County, Pennsylvania  USA

Specimen size: 6.6 × 6.4 × 4.2 cm = 2.60” × 2.52” × 1.65”

Main crystal size: 1.8 × 1.2 cm = 0.71” × 0.47”