A study of sodium-rich quartz-alkali feldspar—biotite gneiss granulite facies terrane in the Kerala Khondalite Belt near Manali in south India found that in situ leucosomes (light colored segregations) within the gneiss showed the development of garnet replacing the dark biotite.
This research investigated the presence of light-colored segregations (leucosomes) within gneiss rocks, specifically in the Kerala Khondalite Belt near Manali, India. The study found that these leucosomes contained garnet replacing the original biotite.