Texas provides many opportunities for gem and mineral hunting. According to Texas Road Runners Rock and Mineral Hunting Guide, agate, marble, fossils, flint, selenite, jasper, petrified wood, granite and petrified palm wood are commonly found in Texas.
Idaho is known as the "Gem State" because it contains 72 different kinds of precious and semi-precious stones. The only other location on the planet which has a greater variety of gems is Africa. Idaho's state gem is the star garnet. Throughout the state there are numerous and popular gem-hunting spots where enthusiasts can find deposits of corundum, jasper, agate, opal, garnet, topaz and zircon.
While you're taking a walk through the wilderness, you come across some interesting looking stones. You think they might be of value, but you have no way of identifying them. There are a few things you can do to identify rough gem stones without the incorporation of highly technical equipment.