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quartz replacement
These nodules form as discrete rounded structures within volcanic basalt
Visible copper banding within the agate
An exceptionally uncommon Copper Replacement Agate containing preserved hematite tube structures and visible native copper mineralization
Copper Replacement/Inclusionbrecciated Ghost Agate Cabochon🌹
Complete Copper Replacement Agate Ring Copper Replacement Agate quartz replacementThis 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
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