Humboldtine
Fe2+(C2O4)·2H2OIMA symbol: Hbdgrandfathered
Humboldtine is an organic mineral with the formula Fe2+(C2O4)·2H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2, typically yellow in color, with a dull or resinous luster, a specific gravity of 2.13-2.489.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 12.011, b = 5.557, c = 9.92; α = 90, β = 128.53, γ = 90 |
| Cell volume | 517.958 ų, Z = 4 |
| Axial ratios | 2.1614:1:1.7851calculated from COD 9017265 |
| Source structure | COD 9017265 (Physics and Chemistry of Minerals, 2008) |
Powder X-ray diffraction (calculated)
| d (Å) | 4.801 | 4.698 | 3.002 | 2.655 | 3.594 | 3.88 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 92.9 | 85.2 | 41.3 | 38.9 | 32.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017265; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.307 g/cm³calculated from COD 9017265 |
|---|---|
| Hardness (Mohs) | 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.13-2.489 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | dull, resinousDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 10.AB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 10.AB.05Wikidata (CC0) |