Perovskite
Perovskite (pronunciation: /pəˈrɒvskaɪt/) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula CaTiO3). Its name is also applied to the class of compounds which have the same type of crystal structure as CaTiO3, known as the perovskite structure, which has a general chemical formula A2+B4+(X2−)3. Many different cations can be embedded in this structure, allowing the development of diverse engineered materials.
| Perovskite | |
|---|---|
Crystals of perovskite on matrix Size: 2.3 cm × 2.1 cm × 2.0 cm (0.9 in × 0.8 in × 0.8 in) | |
| General | |
| Category | Oxide minerals |
| Formula (repeating unit) | CaTiO3 |
| IMA symbol | Prv |
| Strunz classification | 4.CC.30 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pbnm |
| Identification | |
| Formula mass | 135.96 g/mol |
| Color | Black, reddish brown, pale yellow, yellowish orange |
| Crystal habit | Pseudo cubic – crystals show a cubic outline |
| Twinning | complex penetration twins |
| Cleavage | [100] good, [010] good, [001] good |
| Fracture | Conchoidal |
| Mohs scale hardness | 5.0–5.5 |
| Luster | Adamantine to metallic; may be dull |
| Streak | grayish white |
| Diaphaneity | Transparent to opaque |
| Specific gravity | 3.98–4.26 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 2.3, nβ = 2.34, nγ = 2.38 |
| Other characteristics | non-radioactive, non-magnetic |
| References | |
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