Magnesite Swiss Cross Bead.
 
Magnesite is a magnesium carbonate mineral, named after the presence of magnesium in its composition. Magnesite usually forms during the alteration of magnesium-rich rocks or carbonate rocks by metamorphism or chemical weathering. It is a soft mineral (Mohs 3.5-5.0) easily carved into beads.
 
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* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors.