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Many religious folk are opposed to the use of this kind of dating. How acurate is this kind of dating and how do we know this happens over the time frames suggested?
Their abundant, closely spaced crystallites (microscopic embryonic crystal growths) are so numerous that the glass is opaque except on thin edges.
Many samples of obsidian contain spherical clusters of radially arranged, needlelike crystals called spherulites.
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Microlites (tiny polarizing crystals) of feldspar and phenocrysts (large, well-formed crystals) of quartz may also be present.
Most obsidian is associated with volcanic rocks and forms the upper portion of rhyolitic lava flows.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.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.Eruption to the surface, where pressure is low, permits rapid escape of this volatile water and increases the viscosity of the melt.K–Ar dating is part of Wiki Project Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource.Tags: Adult Dating, affair dating, sex dating