Michael's has a large selection of Green River fossil fish in all sizes and price ranges. We also carry orthoceros fossils made into plates, bookends, sculptures, and large specimens suitable for decorating your office or home. Megaladon sharkteeth are also offered again in all sizes and price ranges. Come in and see our life size megaladon jaws!
Agate is classified as an igneous rock, which is rock formed from molten minerals and elements. Inside the earth's crust, near the surface of the mantle, you can find molten rock. Inside this, gas bubbles form and seismic forces push the molten rock away from the intense heat, where the molten rock turns solid around the empty gas bubbles.
Over thousands of years, ground water from the surface flows into the pockets, depositing various minerals in the rocks to form layers of agate crystals. It is a microcrystalline rock and often has pure crystals formed in the final stages of formation.
The age of a geode has never been proven because they form at different rates. Since the earth's crust is
approcimately 72% Silicon dioxide (SiO2) It is the main ingredient of an agate geode. The crystals that
form inside are usually quartz or amethyst