Agate Bookends, Brazil Fossils and the surprising connections between

and the surprising connections between space and modern booze

rolling hill

The speed of which the frog was mineralized allowed it to be preserved in great detail

however many varieties exist in many stunning colors

Agate Bookends, Brazil Fossils and the surprising connections betweenAgate forms in the nodule cavities of volcanic rock when silica rich fluids seep through the volcanic material. Similar to geodes, layers of chalcedony and quartz are built up within the cavity over time, different minerals and concentrations determining the color of each layer. Crystals can form within the agate, reaching inwards to the center of the nodule.