フラックス法で育成したエメラルドの内部組織と育成条件

概要

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Emerald crystals were cultivated in the melt composed of Li_2O-MoO_3 flux and gel powder of 3BeO ・Al_2O_3・6SiO_2 composition using several programs of temperature variation. Their internal textures were observed under the polarizing microscope and correlated with the growth conditions such as temperature and degree of supersaturation. Development of zonal structures, optical anomalies and domain structures are attributed to the temporary fluctuation of temperatures during cultivation. Rapid growth on the non-crystallographic rough surfaces tends to form nail-like inclusions. Prolonged cultivation at a fixed high temperature leads to the formation of feather or lace-like inclusions which are characteristc to the flux-grown emeralds in the market. These results suggest that more perfect crystal of emerald can be obtained from the flux-melt both by slow cooling technique and by strict temperature control.
宝石学会(日本)の論文
1977-03-15