California Rainbow Obsidian Is a Natural Wonder (Amazing Photos)

Obsidian is dense volcanic glass, usually rhyolite in composition and typically black in color. Obsidian with multicolored iridescence caused by inclusions of magnetite nanoparticles. Obsidian is often formed in rhyolite lava flows where the lava cools so fast that crystals do not have time to grow.

The Davis Creek Mercantile in Davis Creek provides maps and permits to the mines, free of charge. Although four-wheel-drive vehicles are not needed, high clearance vehicles are suggested. Free Use Authorizations are available at: Modoc National Forest Supervisor's Office - 800 West 12th Street, Alturas, CA 96101 Warner Mountain Ranger District Office - 385 Wallace Street, Cedarville, CA 96104 Davis Creek Mercantile - 41942 Highway 395, Davis Creek, CA 96108 (Rough rainbow obsidian from Davis Creek. photo: Scott's Rock & Gem)