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Russian Gemstones Encyclopedia

Vladimir Bukanov. Russian Gemstones Encyclopedia

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

STRONTIUM TITANATE


SYNTHETIC STRONTIUM TITANATE – (Synthetisch stronzium Titanat — Synthétique strontium titanate — —интетический титанат cтронци€)

Composition & Properties. Titanate – SrTiO3, cubic system. Hardness 6.5. Density 5.1. Glass luster to greasy one. Very fragile. Strontium titanate, or fabulite is an interesting analogue of a rare mineral tausonite – SrTiO3, named after the Russian geochemist L.V. Tauson (1917-1989). In Russia, it was found in the form of red cubic crystals up to 2 mm in alkali rocks of the Murun alkali massif in Yakutia in 1980. A synthetic strontium titanate was received at first from melt with the method by Verneille in the U.S.A., in 1953. It is colorless, transparent, after annealing with dispersion higher than that of diamond, which leads to displaying of the play of color in faceted stones. It has been being used successfully for long as an imitation of brilliants in jewelries. Its weakness is in its low hardness, because of which edges of faceted stones looks seared. Grown blocks colored black are annealed under the temperature of 2000°C during 6 hours. The admixtures of vanadium, chromium, cobalt, nickel, manganous, iron and tantalum oxides give the possibility to color this material in various tones. Strontium titanate has been widely used in jewelry since 1968, the volume of its output reached 2 million ct. per year. It has many trade names.

Synonyms. Bal de feu, Fr. | Brillite | Cechnite | Diagem | Diamanite | Diamogem | Diamonair | Strontium diamond | Diamontin | Dynagem | Rossini jewel | Jewelite | Lustigem | Marvelite | Mesotitanate | Norbit | Sorella | Starilian | Symant | Pauline trigere, Amer., trade | Wellington | Zenithite.

Among other synthetic titanates, which are of interest as gem-quality rough material, we should mention synthetic zinc orthotitanate, produced with the method by O. Verneille, and close in properties to strontium titanate. Besides, since 1975, they have been producing also synthetic aluminum titanate, as well as barium, calcium and magnesium titanates. Synthetic barium titanate and calcium titanate were used for the imitation of brilliants, magnesium titanate – for the imitation of natural cat’s-eye.

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