Quartz

Porretta quartz sites, Reno Valley, Alto Reno Terme (Porretta Terme), Bologna Province, Emilia-Romagna  Italy

Specimen size: 9 × 5.5 × 3.5 cm = 3.54” × 2.17” × 1.38”
Main crystal size: 4.7 × 3 cm = 1.85” × 1.18”