Figure 4. Emeralds at the Fazenda Bonfim deposit occur
in association with recrystallized pegmatitic bodies that
intruded a sheared succession of talc, talc-amphibole,
and biotite±amphibole schists, adjacent to a granitic
gneiss (the strongly weathered unit at the top). A small
recrystallized pegmatite is visible on the left side, in the
biotite schist. Photo by J. C. Zwaan.