Crazy Lace Agate, also known as Mexican Agate, is a banded fibrous Chalcedony (microcrystalline Quartz) with iron and aluminum.  It is often brightly colored and "crazily" patterned with multicolored twisting and turning bands.
 
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* Photos show all sides.
* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors.