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colored by carotenoids
browns and grays are reminiscent of a rainforest
which takes millions of years
It appears green because of traces of Chromium
as well as its iridescent sparkle
Sieber Agate 4mm Round AA Grade - 15-16 Inch R0007 colored by carotenoidsSieber 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