Sieber Agate 8mm Round AA Grade - 15-16 Inch 6mm Matte and other colorful materials

and other colorful materials

They are rough specimens but polished on one side to show off all it's amazing colors

This stone ranges in color from pink and red to brown

It is a variety of the mineral corundum

Mohs Hardness: 6-6

Sieber Agate 8mm Round AA Grade - 15-16 Inch 6mm Matte and other colorful materialsSieber 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