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CGS:Cr4+, a greenish-blue synthetic melilite (2305)
CGS stands for Calcium Gallium Silicate and it belongs to the melilite-type with its formula Ca2Ga2SiO7. This material is synthesized by Czochralski process and doped with chromium as Cr4+. This...
Purplish-pink synthetic morganite (3764)
During 2017 fall, few stones were facetted from rough of synthetic morganite reportedly originating from Australia. I have not seen the rough in person. The color of the stone is quite saturated and is...
An ancient man-made blue and white glass from Ispahan, Iran (2022)
The piece of blue and white material shown in figure 1 was submitted for analysis. Initially proposed as blue quartz, it also looks like some blue and white sodalite. Such kind of material comes from Iran...
Uranium glass (3082)
Uranium glass is glass which has had uranium (U), usually in oxide diuranate form, added to a glass mix before melting for coloration. The proportion usually varies from trace levels to about 2% by...
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