Figure 8. Trapped air bubbles may be an important
identifying feature for filled emeralds. Although
they vary greatly in size and shape,
large bubbles with irregular outlines - such as
those illustrated here in an Ovticon-treated emerald-
are not unusual. Some of the bubbles
may be highly reflective with a silvery white
hue. Photomicrograph by John I . Koiv~ila;m agnified
15x.