Figure 5. Emeralds commonly
occur near the contact
between re crys tal lized
pegmatite and biotite
schist, as shown in the 15-
cm-wide specimen on the
left. The recrystallized
pegmatitic rocks, mainly
consisting of sodium-rich
feldspar and quartz veins,
show a saccharoidal texture
and may also contain
emeralds (right, image
width 11.5 cm). Photos by
J. C. Zwaan.