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.
Bloodshot Iolite. Known as the gemstone of the Vikings, Iolite was used by Norse and Viking explorers as a navigational aid, as a properly oriented stone would change color in relation to the direction of sunlight, allowing for crude navigation in the fog- enshrouded northern Atlantic waters where the direction of the sun was otherwise impossible to discern.