318 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1926 
Fosterite-—Occurs as an abundant accessory mineral in certain of 
the crystalline limestones at Mogok. It has not been formerly 
reported from Burma. 
In the great pegmatite dyke at Sakangei, lepidolite in very large 
crystals, as well as muscovite, topaz, cassiterite, and very large crys- 
tals of quartz were seen. The topaz occurs in clear, transparent, 
nearly colorless crystals several inches in length. A large crystal 
examined is unique in that it is terminated at one end by the basal 
plane above and at the other end by pyramidal forms. 
