Siderite

Brosso Mine, Cálea, Léssolo, Canavese District, Metropolitan City of Turin Province, Piedmont (Piemonte)  Italy

Specimen size: 16 × 12 × 5.5 cm = 6.30” × 4.72” × 2.17”
Main crystal size: 2 × 2 cm = 0.79” × 0.79”