Figure 2.

TEM results. (a) Transmission Electron Microscopy (TEM) image of mineral interface. Diffraction patterns of the garnet-chlorite interface (top) and garnet-muscovite interface (bottom) oriented such that [$\stackrel{-}{1}11$]_gt is parallel to [0 0 1]_chl,ms. The doubling of planes (highlighted by red circles) suggests an epitaxial relationship between garnet and chlorite and between garnet and muscovite. (b) Stacked electron dispersive spectrometry maps of Mg (magenta), Si (blue), and K (light blue) abundances showing the 4 phases in the TEM foil. Sample is rotated relative to (a). (c) Garnet crystal structure (from Novak and Gibbs²⁸) highlighting the [$\stackrel{-}{1}11$]_gt and [$\stackrel{-}{7}710$]_gt crystal directions (blue and purple lines, respectively) and ($\stackrel{-}{1}11$)_gt and ($\stackrel{-}{7}710$)_gt planes (blue purple sheets).