Fig. 7
From: New material connections in a mother-of-pearl Enconchado from the Viceroyalty of New Spain
Photomicrographs taken with visible illumination of A the front and B the back sides of the shell Sample S4, original magnification 50x. C SEM-BSE image of Sample S4 showing abrasion marks from the processing to separate the nacre layer. D–F EDS maps of Si, O, and Ca, respectively. The silicon-containing residues embedded on the surface are likely from the tool(s) used to abrade the shell. The elemental composition of the silica particles in the area indicated with a red square in C is included in Table 1