Arsenopyrite
FeAsSIMA symbol: Apyapproved
Arsenopyrite is a sulfide or sulfosalt mineral with the formula FeAsS, crystallizing in the monoclinic system. It has a Mohs hardness of 5.5-6, typically white or gray in color, with a metallic luster, a specific gravity of 5.9-6.2. Its streak is black or gray.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 5.7612, b = 5.6841, c = 5.7674; α = 90, β = 111.721, γ = 90 |
| Cell volume | 175.456 ų, Z = 4 |
| Axial ratios | 1.0136:1:1.0147calculated from COD 9016639 |
| Source structure | COD 9016639 (The Canadian Mineralogist, 2012) — 1 of 8 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.442 | 2.421 | 2.423 | 1.818 | 1.635 | 2.676 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 53.8 | 48.9 | 48.7 | 46.8 | 46 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9016639; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.164 g/cm³calculated from COD 9016639 |
|---|---|
| Hardness (Mohs) | 5.5-6single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5.9-6.2 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceWikidata (CC0) black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 162.83 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Fe 34.3%, As 46.01%, S 19.69% |
Classification
| Nickel-Strunz (10th) | 2.EB.20Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.20Wikidata (CC0) |