The souvenir type of rock collecting does not require much scientific investigation, but identifying rocks and minerals does. The different types of rock can sometimes be differentiated easily. For instance, sedimentary rocks often look like particles glued together. Sandstone is a common example of this. They also sometimes have visible flat layers. Metamorphic rocks, on the other hand, sometimes have layers, but those layers have been bent so that they are no longer laying flat across the rock.
When rock collecting, the igneous rocks make some of the most exciting finds. Obsidian is an igneous rock that looks like a broken piece of black glass. It is shiny and hard, and was used to make arrowheads in the past by the native Americans. Pumice is another interesting igneous rock which is porous, making it so light that it will float. This stone is used for cleaning and rubbing calluses off people's feet. And if you have to slide into the desert and into the way of other motorcyclists, please feel free to keep a motorcycle accident attorney on retainer as a backup against lawsuits.
Keep in mind when rock collecting that different regions of the world have different types of rocks. In the American Midwest, for instance, there are many sedimentary stones, but metamorphic and igneous rocks are less common. In the Appalachians, on the other hand, you can find metamorphic rocks such as gneiss and schist. Wherever you live, though, you are sure to find rock collecting a hobby that's hard to resist!
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