Brannerite
UTi2O6IMA symbol: Bnrapproved
Brannerite is an oxide or hydroxide mineral with the formula UTi2O6, crystallizing in the monoclinic system. It has a Mohs hardness of 5-5.5, typically black, brown or red in color, with a resinous or vitreous luster, a specific gravity of 4.2-4.36. Its streak is brown or yellow.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 9.8123, b = 3.7697, c = 6.9253; α = 90, β = 118.957, γ = 90 |
| Cell volume | 224.138 ų, Z = 2 |
| Axial ratios | 2.6029:1:1.8371calculated from COD 9004165 |
| Source structure | COD 9004165 (The Canadian Mineralogist, 1982) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.452 | 4.753 | 3.357 | 2.902 | 2.47 | 6.06 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 74.4 | 55 | 43.1 | 40.9 | 40.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004165; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.368 g/cm³calculated from COD 9004165 |
|---|---|
| Hardness (Mohs) | 5-5.5single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 4.2-4.36 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, brown, redsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | brown, yellowsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | resinous, vitreoussingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 429.76 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | U 55.39%, Ti 22.28%, O 22.34% |
Classification
| Nickel-Strunz (10th) | 4.DH.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.DH.05Wikidata (CC0) |