钛酸锶，化学式SrTiO₃。

白色立方晶体，具有高折射常数和介电系数，为有毒化学物品。

立方晶系，无色，折射率n＝2．409，色散0．190，相对密度5．13，硬度5～6，无解理，断口贝壳状。在紫外光下无荧光，这种人造宝石常被切磨成祖母绿型是一种十分良好的钻石代用品。

Strontium titanate is an oxide of strontium and titanium with the chemical formula SrTiO₃. At room temperature, it is a centrosymmetric paraelectric material with a perovskite structure. At low temperatures it approaches a ferroelectric phase transition with a very large dielectric constant ~10 but remains paraelectric down to the lowest temperatures measured as a result of quantum fluctuations, making it a quantum paraelectric. It was long thought to be a wholly artificial material, until 1982 when its natural counterpart—discovered in Siberia and named tausonite—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.