Sieber Agate 10mm Round AA Grade - 15-16 Inch 48hr_01202026 Ethiopian Opal typically occurs in

Ethiopian Opal typically occurs in brown

The blue colors are photosensitive and may fade when exposed to excessive light or heat

It is a white granite with dark gray mottling that also exhibits blue or green spots

) Seraphinite is most commonly found in shades of dark green and gray

Sieber Agate 10mm Round AA Grade - 15-16 Inch 48hr_01202026 Ethiopian Opal typically occurs inSieber 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