Quartz after Octahedral Fluorite

Wheal Mary Ann, Menheniot, Liskeard, Cornwall  United Kingdom

Specimen size: 7.5 × 6.4 × 3.3 cm = 2.95” × 2.52” × 1.30”
Main crystal size: 1.5 × 1.5 cm = 0.59” × 0.59”