Calcite on Quartz - Sheffler's Rock Shop and Geode Mine, USA - the geode cavity is about 18 cm and the largest calcites are about 3.5 cm
Mineral: Calcite on Quartz
Locality: Sheffler's Rock Shop and Geode Mine, Alexandria, Clark County, Missouri, USA
Dimensions: the geode cavity is about 18 cm and the largest calcites are about 3.5 cm

Description: mined in the early 1980s at the old mine location