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Obsidian hydration can indicate an artifact's age if the datable surfaces tested are only those exposed by flintknapping.Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!The effect of composition can be determined from chemical analysis or the refractive index of the glass.

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Exposure-temperature history requires a number of considerations enumerated in this paper. We offer a variety of different analytical services related to obsidian artifact trace element provenance ("sourcing") studies and obsidian source studies, primarily in the context of archaeological research.

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