Quartz on Quartz (variety chalcedony) - , USA - geode cavity is about 10 cm with a thick rind

Mineral: Quartz on Quartz (variety chalcedony)
Locality: Monroe County, Indiana, USA
Dimensions: geode cavity is about 10 cm with a thick rind

Description: crystalline quartz on blue chalcedony (microcrystalline quartz) at least 3 generations of quartz. Crystalline quartz topped by blue chalcedony and then covered by crystalline quartz. Perfectly fresh with no iron staining or degeneration and corrosion.