LL Demos & Labs: Rock Profile: Wonderstone
Wonderstone is collected in Northern Utah’s west desert. It was formed when thick, gooey, quartz-rich lava, called rhyolite erupted onto the earth’s surface and rapidly cooled. This lava is the same material found in both pumice and obsidian. However wonderstone is a very uncommon type of igneous rock. The beautiful banding pattern you see in your sample have been created by mineral impurities that were trapped in the cream- colored rhyolite. Because the rock is very porous, the mineral migrate and collect with one another as they form. The was first discovered by a German geologist who used the leisegang to describe the banding.