Fig. 4
From: Complementary scientific techniques for the study of Mesoamerican greenstone objects
a Photograph of Cylindrical Bead Depicting a Serpent (2000.232.FA) with detailed SEM image (blue box) and more detailed SEM image (orange box) with elemental mapping of O, Na, Mg, Al, Si, Ca, C, and Fe, respectively, b XRD pattern, and c Raman spectrum
