Bismite
Bi2O3IMA symbol: Bisgrandfathered
Bismite is an oxide or hydroxide mineral with the formula Bi2O3, crystallizing in the monoclinic system. It has a Mohs hardness of 2, typically gray in color, with a metallic luster, a specific gravity of 6.6.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 5.8486, b = 8.1661, c = 7.5097; α = 90, β = 113, γ = 90 |
| Cell volume | 330.153 ų, Z = 4 |
| Axial ratios | 0.7162:1:0.9196calculated from COD 9012546 |
| Source structure | COD 9012546 (Acta Chemica Scandinavica, 1970) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.253 | 3.254 | 3.183 | 2.692 | 3.456 | 1.958 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 58.4 | 37 | 35.7 | 33.5 | 31.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012546; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 9.374 g/cm³calculated from COD 9012546 |
|---|---|
| Hardness (Mohs) | 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.6 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 465.96 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Bi 89.7%, O 10.3% |
Classification
| Nickel-Strunz (10th) | 4.CB.60Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 4.CB.60Wikidata (CC0) |