Daubréelite
FeCr2S4IMA symbol: Dbrgrandfathered
Daubréelite is a sulfide or sulfosalt mineral with the formula FeCr2S4, crystallizing in the cubic system. It has typically black in color, with a metallic luster, a specific gravity of 5.01. Its streak is black.
Photos
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F d -3 m :2 |
| Cell (Å, °) | a = 9.9763, b = 9.9763, c = 9.9763; α = 90, β = 90, γ = 90 |
| Cell volume | 992.907 ų, Z = 8 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9014102 |
| Source structure | COD 9014102 (Journal of Chemical Physics, 2008) — 1 of 16 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.008 | 1.764 | 2.494 | 1.92 | 3.527 | 1.299 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 92.4 | 53.7 | 48.4 | 33.9 | 16 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9014102; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.855 g/cm³calculated from COD 9014102 |
|---|---|
| Specific gravity | 5.01 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 288.1 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Fe 19.38%, Cr 36.1%, S 44.52% |
Classification
| Nickel-Strunz (10th) | 2.DA.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.DA.05Wikidata (CC0) |
| Dana (8th) | 2.10.1.11Wikidata (CC0) |