Complete Copper Replacement Agate Ring Copper Replacement Agate This ring features a large

This ring features a large chlorastrolite (Michigan “greenstone”) cabochon sourced from the Keweenaw Peninsula region of Lake Superior

These nodules form as discrete rounded structures within volcanic basalt

Internal fractures and mixed mineral zones are common

One-of-a-kind collector specimen

Complete Copper Replacement Agate Ring Copper Replacement Agate This ring features a largeThis ring is built around a copper replacement agate sourced from naturally formed nodules found within amygdaloidal basalt in the Keweenaw Peninsula region of Michigans Upper Peninsula. These nodules form as discrete rounded structures within volcanic basalt, and only a small percentage contain material suitable for cutting once exposed. Many are fractured, partially mineralized, or structurally unstable due to the way secondary copper mineralization