Ream Idaho and western Montana are two of the Northwest's most popular rock and gem collecting destinations, overflowing with beautiful scenery, mineral riches and rockhounding adventure. In this helpful guide to the Gem State and the western half of the Big Sky State, geologist and best-selling author, Lanny Ream, is your personal guide to 99 of the best collecting sites in this geographically dramatic and varied region. Discover and collect: agates, jasper, gold, garnet, sapphires, geodes/thundereggs, amethyst, fluorite, quartz varieties, tourmaline, pyrite, topaz, trilobites, chrysocolla, petrified wood and more. All site descriptions also include a brief overview and explanation of the collecting area, a detailed map to the site and photos of what you'll find when you get there. 256 pgs.