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The magnetic properties of volcanic glass and obsidian have long been known. Selected magnetic properties have proven useful discriminators among eastern Mediterranean obsidian sources. A recent exploratory study of the magnetic susceptibility of Southwestern obsidians indicates that it may prove a useful tool in this region also. Magnetic measurements of samples from many of the major obsidian sources in the Southwest were analyzed in an exploratory study of the technique and the resulting data are presented here. The technique and its limitations are also discussed.

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