Pocket Genius: Rocks and Minerals (part of the Facts at Your Fingertips
Using your digital guide, here are the most sought-after specimens currently trending in the rockhounding community. pocket genius rocks and mineralspdf hot
: Interactive "thermal sliders" that show the difference between rocks cooled quickly on the surface (extrusive igneous, like Basalt ) versus those that stayed "hot" for centuries deep underground (intrusive igneous, like Granite ). Pocket Genius: Rocks and Minerals (part of the