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Obsidian flows which may be hiked on are found within the calderas of Newberry Volcano and Medicine Lake Volcano in the Cascade Range of western North America, and at Inyo Craters east of the Sierra Nevada in California. states of Virginia, as well as Pennsylvania and North Carolina.Yellowstone National Park has a mountainside containing obsidian located between Mammoth Hot Springs and the Norris Geyser Basin, and deposits can be found in many other western U. states including Arizona, Colorado, New Mexico, Texas, Utah, Washington, and Idaho. There are only four major deposit areas in the central Mediterranean: Lipari, Pantelleria, Palmarola and Monte Arci.An iridescent, rainbow-like sheen (rainbow obsidian) is caused by inclusions of magnetite nanoparticles.Canada, Chile, Georgia, Greece, El Salvador, Guatemala, Iceland, Italy, Japan, Kenya, Mexico, New Zealand, Papua New Guinea, Peru, Scotland, Turkey and the United States.The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.
These bubbles can produce interesting effects such as a golden sheen (sheen obsidian).
Pure obsidian is usually dark in appearance, though the color varies depending on the presence of impurities.