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copper replacement
quartz replacement
Copper Replacement/Inclusionbrecciated Ghost Agate Cabochon🌹
Copper Replacement Eye Agate – A Rare Piece of Michigan's Copper Country
This Copper Replacement Eye Agate was recovered from the historic mine regions of Michigan's Keweenaw Peninsula
Complete Copper Replacement Agate Ring Copper Replacement Agate copper 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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