Agate Geode

Availability: 1 in stock


This lovely round tabletop sized Agate Geode has had its front sliced and polished to reveal fine lacing along the outside and a very deep cavity in the center which is covered in sparkly Quartz Crystals with contrasting black mineral spots visible behind the Quartz. The bottom has also been sliced off to allow it to stand unassisted. 

On the outside, agate geodes appear to be nothing but rock, but looking deeper into the interior of a geode will reveal amazing crystal growth and formations. Agate geode crystals are usually composed of quartz or chalcedonic deposits, but various other minerals such as calcite, celestite and dolomite are also commonly found within other varieties of geodes.

Most geodes develop in small hollow burrows within the earth, the formation begins from a small piece of limestone or anhydrite and over time, mineral-rich waters seep into the burrow allowing the minerals to harden around the small rock. It is through the repetitive series of hardening deposits from mineral-rich waters that eventually form the crystalline structure and outer crust of the geode.

The crystal production that develops within a geode depends on several variables including the amount of moisture trapped within the geode, the various chemicals and rich minerals deposited, and the amount of pressure applied to the geode. If the balance of these variables is just right, crystal formations will begin to grow within the walls of the shell. The crystals build and grow inward towards the center, slowly filling the geode out. The entire process takes millions of years. Many geode specimens have been estimated to be over 250 million years old.

Length: 140mm
Width: 85mm
Height: 110mm
Weight: 1.826g