Gem Mountain - great place to mine for your own sapphires in Montana
Zoisite, Tanzanite from Gemstone Safari :: A Travel Group where you dig for sapphires during a few days and learn about the particularities of the local geology. A group of miners assists you. All the stones you find are yours to keep.
Map of Gem Locations (Outdoor Idaho: The Gem State)
Opal - Virgin Valley, Humboldt County, Nevada mw
Identify an Unopened Geode
How to Identify an Unopened Geode: 5 Steps (with Pictures)