Trapiche Garnet
Trapiche-patterned garnet is an exceptionally unusual occurrence within the species. The material originates from Chun’an, Zhejiang Province, China, where grossular crystals formed as rhombic dodecahedrons. Although the crystals appear nearly black due to numerous fine inclusions and fractures that scatter light, they are in fact largely transparent. When a crystal is sliced precisely through its center, a distinctive trapiche structure becomes visible, produced by planes of dark inclusions concentrated along the edges of the crystal faces. Because the pattern only appears in the central section, each crystal typically yields only a single slice displaying the characteristic radial motif.
Spectroscopic and chemical analysis confirms the host mineral as grossular garnet. The pale greyish-pink coloration reflects very low concentrations of typical chromophoric elements such as iron, manganese, chromium, and vanadium. Under ultraviolet excitation the material displays notable luminescence, with strong orange fluorescence under long-wave UV and a brown-yellow glow under short-wave UV. Fluorescence imaging also reveals mirrored growth sectors within the crystal that together produce the pseudo-hexagonal trapiche pattern seen in the finished slices.
