Figure 15. Platelets of phlogopite (left, image width 0.7 mm) and clusters of minute inclusions of quartz (right, image width 1.5 mm) were observed in some of the emeralds. Photomicrographs by J. C. Zwaan.
Figure 15. Platelets of phlogopite(left, image width 0.7mm) and clusters of minuteinclusions of quartz (right,image width 1.5 mm) wereobserved in some of theemeralds. Photomicrographsby J. C. Zwaan.