The crystal chemistry of pumpellyite from Sugashima and julgoldite from Kouragahana, Japan: Toward a comprehensive understanding of the crystal chemistry of pumpellyite-group minerals
Journal: Journal of Mineralogical and Petrological Sciences
Year: 2025

Single-crystal X-ray crystal-structure refinements and electron-microprobe analyses of julgoldite from Kouragahana, Shimane Peninsula, and pumpellyite from Sugashima, Mie, Japan yielded the compositions of W Ca2.00 X (Fe0.69Mg0.20Al0.11)1.00Y (Fe 3+ 1.46Al0.54)2.00Si3.00O14-n(OH)n and W Ca2.00 X (Al0.56Mg0.35Fe0.09)1.00Y Al2.00Si3.00O14-n(OH)n(4 n 3), respectively.The latter was classified as pumpellyite-(Al), while the former can only be concluded to be either julgoldite-(Fe 3+ ) or julgoldite-