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Rare colours of obsidian can also be blue, red, orange or yellow.
The colour of obsidian is thought to be from the trace elements.
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, Oregon and Idaho. There are only four major deposit areas in the central Mediterranean: Lipari, Pantelleria, Palmarola and Monte Arci.
Obsidian mainly forms of black colour however this colour is not the only one but is the most common colour.
It can also be of different colours like brown, tan or green.
Anatolian sources of obsidian are known to have been the material used in the Levant and modern-day Iraqi Kurdistan from a time beginning sometime about 12,500 BC.
Obsidian consists mainly of Si O2 (silicon dioxide), usually 70% or more.
Crystalline rocks with obsidian's composition include granite and rhyolite.
Pumice, scoria, and tachylyte are other volcanic glasses formed by rapid cooling.
Pumice and scoria differ from obsidian by having abundant vesicles - cavities in the rock produced when gas bubbles were trapped in a solidifying melt.