Perovskite
CaTiO3IMA symbol: Prvgrandfathered
Perovskite is an oxide or hydroxide mineral with the formula CaTiO3, crystallizing in the orthorhombic system. It has a Mohs hardness of 5.5, typically black, brown, gray or orange in color, with an adamantine or metallic luster, a specific gravity of 4.017. Its streak is colorless or gray.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P b n m |
| Cell (Å, °) | a = 5.444, b = 5.4591, c = 7.7213; α = 90, β = 90, γ = 90 |
| Cell volume | 229.472 ų, Z = 4 |
| Axial ratios | 0.9972:1:1.4144calculated from COD 9002802 |
| Source structure | COD 9002802 (American Mineralogist, 2002) — 1 of 19 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.728 | 1.927 | 2.73 | 2.722 | 1.364 | 1.93 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 47.9 | 26.6 | 25.6 | 23.5 | 23.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002802; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.279 g/cm³calculated from COD 9002802 |
|---|---|
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) 5.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.017 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brown, gray, orange, red, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | colorless, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 135.94 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 29.48%, Ti 35.21%, O 35.31% |
Classification
| Nickel-Strunz (10th) | 4.CC.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.CC.30Wikidata (CC0) |