Sieber Agate 10mm Round AA Grade - 15-16 Inch Size_7-10mm and often features color banding

and often features color banding

among other numerous names

Boulder Opal is believed to help with spiritual development

with additional major finds in 2008 and 2013

Iolite most commonly occurs in shades of blue to gray

Sieber Agate 10mm Round AA Grade - 15-16 Inch Size_7-10mm and often features color bandingSieber 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