Other types with dark bands or mottling in gray, green, or yellow are also known.rhyolitic lavas may contain up to 10 percent water, which helps to keep them fluid even at a low temperature.
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:: Oh, and yeah, unless a particular religious objection to radiometric dating techniques is notable, ::there is no reason to include it in an article.
This same discussion has gone on ad nauseum ::over at Radiocarbon dating.100 000a) might be wrong.Could somebody having a copy of Harrison and Mc Dougall check?The following currently is on another wikipage, but I think it ought to be here instead.Obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes.Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, and has a chemical composition similar to rhyolite.Obsidian has a glassy lustre and is slightly harder than window glass.