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It is frequently fluorescent under ultraviolet light
Norway where this type of igneous rock is found
due to variations in iron content
found only in the Dominican Republic
Sieber Agate 10mm Round AA Grade - 15-16 Inch Stone Type_Chrysocolla It is frequently fluorescent underSieber agate is not a true agate but rather a glassy, dark blue grey or green copper slag that formed during ancient copper smelting in Germany, specifically from the Siebertal area. This historical "ancient slag" has a naturally swirling, intricate appearance resembling agate due to silica and mineral inclusions from the smelting process. It is a rare and collectible material known for its lapidary qualities, similar to obsidian, and is sometimes
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