Bismutite
Bi2O2(CO3)IMA symbol: Bitgrandfathered
Bismutite is a carbonate or nitrate mineral with the formula Bi2O2(CO3), crystallizing in the orthorhombic system. It has a Mohs hardness of 4-4.5, typically white, gray, green or yellow in color, with a dull or vitreous luster, a specific gravity of 6.86-6.9. Its streak is colorless or gray.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | I m m 2 |
| Cell (Å, °) | a = 3.865, b = 3.862, c = 13.675; α = 90, β = 90, γ = 90 |
| Cell volume | 204.122 ų, Z = 2 |
| Axial ratios | 1.0008:1:3.5409calculated from COD 9004677 |
| Source structure | COD 9004677 (The Canadian Mineralogist, 2002) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.948 | 2.947 | 2.732 | 2.134 | 6.837 | 1.75 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 86.3 | 67.8 | 43.2 | 41.4 | 40 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004677; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 8.297 g/cm³calculated from COD 9004677 |
|---|---|
| Hardness (Mohs) | 4-4.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.86-6.9 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greysingle sourceWikidata (CC0) colorless, gray, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | dull, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 509.97 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Bi 81.96%, O 15.69%, C 2.36% |
Classification
| Nickel-Strunz (10th) | 5.BE.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.BE.25Wikidata (CC0) |