Some of the mineral contains light brown marbling that is unique to the area. Obsidian plays historical importance to Gem Valley as it was used by the Shoshone Indians that once inhabited for knives and arrowheads. Other local gemstones that are common to Gem Valley are geode, quartz, agate, and petrified wood
Some of the minerals in Gem Valley display unique light brown marbling patterns. Obsidian holds great importance in the area's past, as it was employed by the Shoshone Indians for making knives and arrowheads. Other notable gemstones discovered in Gem Valley include geode, quartz, agate, and petrified wood.