Bicolor tourmaline crystals are highly prized, multi-colored mineral specimens that display two distinct color zones within a single crystalline structure. This beautiful phenomenon occurs due to shifting environmental conditions and trace element concentrations during the crystal's millions-of-years-long growth process. In their natural state, these crystals grow in elongated, striated prisms. Collectors and mineral enthusiasts heavily seek out damage-free, terminated specimens that showcase clear boundaries between the color zones, often resting on a matrix of quartz or cleavelandite…. From Afghanistan Weight : 6.8 grams Size : 25x3x3mm 22x3x3mm 23x4x4mm 18x2x2mm