It's typically splintery to work - a factor of it's vitreous nature, but it's soft and machines quickly so it's easy to get a shape and pre-form done. Take your time when polishing however as the material shows every fault in your polishing process - miss a patch adn your exposed! the finished 25x18mm cabochon was set in a silver plated commercial setting.
25x18mm Snowflake Obsidian - Mexico
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