Cubanite
CuFe2S3IMA symbol: Cbngrandfathered
Cubanite is a sulfide or sulfosalt mineral with the formula CuFe2S3, crystallizing in the orthorhombic system. It has a Mohs hardness of 4, typically brown in color, a specific gravity of 4.026-4.04. Its streak is black; cleavage is distinct.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P c m n |
| Cell (Å, °) | a = 6.46, b = 11.1, c = 6.22; α = 90, β = 90, γ = 90 |
| Cell volume | 446.011 ų, Z = 4 |
| Axial ratios | 0.5820:1:0.5604calculated from COD 9001495 |
| Source structure | COD 9001495 (American Mineralogist, 1992) — 1 of 8 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.211 | 1.861 | 3.486 | 2.995 | 1.742 | 3.23 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 70.9 | 68.4 | 53.9 | 44.3 | 43.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001495; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.042 g/cm³calculated from COD 9001495 |
|---|---|
| Hardness (Mohs) | 4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.026-4.04 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceWikidata (CC0) |
| Cleavage | distinctDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 271.43 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 23.41%, Fe 41.15%, S 35.44% |
Classification
| Nickel-Strunz (10th) | 2.CB.55aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CB.55Wikidata (CC0) |