Blue Banded Agate Tumbled Semi-Precious Collectible Gemstone

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Blue Banded Agate is a type of agate that displays distinctive bands of various shades of blue. Blue Banded Agate is a type of chalcedony, which is a mineral belonging to the quartz family. Tumblestones or "tumbled stones" as they are also called are made by "tumbling" rough crystals in grit for a number of days in a giant tumbler machine. As time passes, finer and finer grit i...