Iodargyrite
AgIIMA symbol: Iagapproved
Iodargyrite is a halide mineral with the formula AgI, crystallizing in the hexagonal system. It has typically brown, green or yellow in color, with a resinous luster, a specific gravity of 5.6-5.7. Its streak is yellow.
Photos
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Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63 m c |
| Cell (Å, °) | a = 4.599, b = 4.599, c = 7.524; α = 90, β = 90, γ = 120 |
| Cell volume | 137.818 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.6360calculated from COD 9011694 |
| Source structure | COD 9011694 (Physical Review B, 1999) — 1 of 4 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.983 | 2.3 | 2.735 | 1.991 | 1.505 | 3.762 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 22.7 | 19.6 | 14.6 | 11.5 | 7.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011694; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.657 g/cm³calculated from COD 9011694 |
|---|---|
| Specific gravity | 5.6-5.7 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, green, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 234.77 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ag 45.95%, I 54.05% |
Classification
| Nickel-Strunz (10th) | 3.AA.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 3.AA.10Wikidata (CC0) |