Prehistoric Fossil Mud #2 Popular Crystals_Optical Calcite Arsenopyrite and Ferberite (Wolframite) specimens

Arsenopyrite and Ferberite (Wolframite) specimens which are often considered the best in the world

This find of Blue Chalcedony

with the Egyptians using it in cosmetics and the Incans making alloys for knives from it

the green variety is also known as Verdite

Prehistoric Fossil Mud #2 Popular Crystals_Optical Calcite Arsenopyrite and Ferberite (Wolframite) specimensFound in the North African desert, this is an example of ironstone regolith concretion formed by the hardening of iron rich mud in layers over huge periods of time in sedimentary sandstone. Although the technical term would be ironstone concretion, it's much easier to explain as fossilised mud, due to how they were created, with each piece having a totally unique form and pattern. You'll receive the exact piece of 'fossil mud' as pictured.