Marcasite
FeS2IMA symbol: Mrcgrandfathered
Marcasite is a sulfide or sulfosalt mineral with the formula FeS2, crystallizing in the orthorhombic system. It has a Mohs hardness of 6-6.5, typically yellow in color, with a metallic luster, a specific gravity of 4.85-4.9. Its streak is black or brown.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n n m |
| Cell (Å, °) | a = 4.4446, b = 5.4246, c = 3.3864; α = 90, β = 90, γ = 90 |
| Cell volume | 81.647 ų, Z = 2 |
| Axial ratios | 0.8193:1:0.6243calculated from COD 9013067 |
| Source structure | COD 9013067 (International Journal of Coal Geology, 2007) — 1 of 5 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.694 | 1.758 | 3.438 | 2.413 | 1.911 | 2.315 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 76.2 | 59.8 | 42.1 | 39.3 | 38.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013067; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.88 g/cm³calculated from COD 9013067 |
|---|---|
| Hardness (Mohs) | 6-6.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.85-4.9 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | black, brown, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 119.97 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Fe 46.55%, S 53.45% |
Classification
| Nickel-Strunz (10th) | 2.EB.10aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.10aWikidata (CC0) |
| Dana (8th) | 2.12.2.1Wikidata (CC0) |