| 摘要 |
PURPOSE:To obtain a single crystal of ornamental synthetic forsterite having superior tone and exhibiting plaeochroism by incorporating a specified amt. of chromic oxide to forsterite. CONSTITUTION:The titled single crystal comprises forsterite consisting essen tially of MgO and SiO2 contg. 0.001-4.0wt% chromic oxide. The single crystal is prepd. from a mixture of starting materials consisting of MgO, SiO2 admixed with 0.001-4.0wt% chromic oxide as colorant by the Czochralski method, flux method, Verneuil method, etc. The obtd. single crystal exhibits different tone in green, blue, or violet depending on the direction of observation, namely plaeochromic behavior. Czochralski method is most preferred for obtg. a uniform and large crystal.
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