Anatase
TiO2IMA symbol: Antapproved
Anatase is an oxide or hydroxide mineral with the formula TiO2, crystallizing in the tetragonal system. It has a Mohs hardness of 5.5-6, typically black, blue, brown or green in color, with an adamantine or metallic luster, a specific gravity of 3.82-3.95. Its streak is red.
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I 41/a m d :1 |
| Cell (Å, °) | a = 3.785, b = 3.785, c = 9.5196; α = 90, β = 90, γ = 90 |
| Cell volume | 136.38 ų, Z = 4 |
| Axial ratios | 1.0000:1:2.5151calculated from COD 7206075 |
| Source structure | COD 7206075 (CrystEngComm, 2011) — 1 of 9 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.517 | 1.893 | 2.38 | 1.701 | 1.667 | 1.481 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 29.8 | 22 | 19.1 | 18.6 | 15.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 7206075; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.89 g/cm³calculated from COD 7206075 |
|---|---|
| Hardness (Mohs) | 5.5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.82-3.95 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, blue, brown, green, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 79.87 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ti 59.93%, O 40.07% |
Classification
| Nickel-Strunz (10th) | 4.DD.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DD.05Wikidata (CC0) |