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Strontium: Strontium Titanate
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Strontium titanate is an oxide of strontium and titanium with the chemical formula SrTiO3. It is a centrosymmetric ferroelectric material with a perovskite structure. It was long thought to be a wholly artificial material, until 1982 when its natural counterpart—discovered in Siberia and named [T]ausonite—was recognised by the IMA. Tausonite remains an extremely rare mineral in nature, occurring as very tiny crystals. Its most important application has been in its synthesized form wherein it is occasionally encountered as a diamond simulant, in precision optics, in varistors, and in advanced ceramics.
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Strontium titanate has an extremely high refractive index and an optical dispersion greater than that of diamond, making it useful in a variety of optics applications. This quality has ... led to it being cut into gemstones, in particular as a diamond simulant. However, it is very soft and easily scratches so it is rarely used.
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Strontium titanate has an extremely high refractive index and an optical dispersion greater then diamond. This has lead to its use in gemstones, although it has been found to be very soft.
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Strontium Titanate