Figure 6.22m. Monazite Inclusion in Kyanite. An age of 1755 Ma was obtained from this monazite inclusion in a kyanite porphyroblase. Therefore, the rock must have been growing kyanite at least until 1755 Ma. Photomicrographs on the left; Th and Y maps on the right. Data from Cheney et al. (2004). J.T. Cheney photos.
