view crystal in whole frame

Atomic Positional Parameters
Ca 4c -0.0068 0.0360 0.2500
Ti 4b  0.0000 0.5000 0.0000
O1 4c  0.0714 0.4838 0.2500
O2 8d  0.7108 0.2888 0.0371

Reference
S Sasaki, CT Prewitt, JD Bass and WA Schulze (1987) Acta Crystallographica C, 43, 1668-1674

Mineral Chemistry
Perovskite, CaTiO₃, is the type-structure for a large family of compounds with the formula 'ABX₃'. When 'X' is oxygen, the value of the oxidation states of 'A' and 'B' must add to six. A number of combinations are found which conform to this formula. Thus, 'A' may be divalent (Ca, Sr, Ba, Cd, Pb) and 'B' quadrivalent (Ti, Th, Zr, Hf, Sn Ge), or 'A' and 'B' may be both trivalent (eg. LaAlO₃). A third alternative is for 'A' to be univalent and 'B' pentavalent (eg. NaWO₃).

In perovskite itself, calcium is surrounded by twelve oxygens, and titanium is octahedrally coordinated by oxygen; these octahedra share apices. Under the high pressures of the lower mantle (> 670 km below the earth's surface), Mg- and Ca- rich silicates are expected to adopt the perovskite structure.

Perovskite is found in nepheline syenites and carbonatites.

The CHIME figure shows the network of TiO₆ octahedra with calcium ions shown as blue spheres. The unit cell is outlined.