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Rough: Obsidian, rainbow, OR
Rough rainbow obsidian, OR

The rough rainbow obsidian from Oregon is mostly smaller sizes weighing from approximately a few ounces to 1/2 pound. (Stock 562) The excellent quality rough can be used for slabbing or tumbling. For maximum slabs from your rough and ease of slabbing small stones, check out the procedure for slabbing small rough using Plaster of Paris forms listed under Assorted Lapidary Tips.