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which can shift or fail unpredictably under pressure from the wheel
The visible inclusions and natural fracture lines are not defects in presentation—they are part of the geological formation process of chlorastrolite
Soft layers of cream
This piece is presented as a mineral specimen study exploring the intersection of geological formation and biologically suggestive growth patterns
Even when a nodule appears promising externally
Rare Hematite Tube Copper Replacement Agate Copper Replacement Agate which can shift or failRare Hematite Tube Copper Replacement Agate Keweenaw Peninsula, Michigan An exceptionally uncommon Copper Replacement Agate containing preserved hematite tube structures and visible native copper mineralization. The dark tube like formations within this specimen are composed of hematite, while native copper occurs around portions of the tubes and can be observed within the agate itself, including a small but distinct area of copper banding. The