TFG170XXX: A group of cubic Pyrite crystals, of good size for the locality, lustrous and with well-defined faces. The specimen stands out for the excellent preservation of the crystals, better than is usually seen in specimens of this type from the Hilston beaches.

Geologically, Pyrite formed by precipitation from iron- and sulfur-rich fluids during the diagenesis of marine sediments. Subsequent erosion of the Holderness coastal cliffs released these mineralized nodules.
Hilston beaches, Holderness, East Riding of Yorkshire, Yorkshire  England / United Kingdom

Specimen size: 6.8 × 6.7 × 4.6 cm = 2.68” × 2.64” × 1.81”

Main crystal size: 2 × 1.3 cm = 0.79” × 0.51”