Sieber Agate 10mm Round AA Grade - 15-16 Inch Tree Agate Hypersthene is often categorized as

Hypersthene is often categorized as enstatite or ferrosilite

Labradorite is usually gray-green

It is an aluminum borosilicate mixed with iron

and typically appear in light yellow to green to blue to green to deep moss green

These inclusions give it a glistening effect termed “aventurescence

Sieber Agate 10mm Round AA Grade - 15-16 Inch Tree Agate Hypersthene is often categorized asSieber 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