Coccinite
HgI2IMA symbol: Ccigrandfathered
Coccinite is a halide mineral with the formula HgI2, crystallizing in the tetragonal system. It has a calculated density of 6.393 g/cm3.
Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
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| Space group | P 42/n m c :2 |
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| Cell (Å, °) | a = 4.365, b = 4.365, c = 12.389; α = 90, β = 90, γ = 90 |
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| Cell volume | 236.05 ų, Z = 2 |
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| Axial ratios | 1.0000:1:2.8383calculated from COD 9014330 |
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| Source structure | COD 9014330 (Acta Crystallographica, Section B, 2007) — 1 of 8 structures |
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Powder X-ray diffraction (calculated)
| d (Å) | 3.568 | 4.117 | 2.186 | 2.763 | 2.183 | 3 |
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| I/I₀ | 100 | 90.5 | 80.6 | 51.7 | 43.6 | 41.6 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9014330; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.393 g/cm³calculated from COD 9014330 |
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Chemistry (calculated)
| Molecular weight | 454.4 g/molcalculated from the IMA formula |
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| Composition (wt%) | Hg 44.14%, I 55.86% |
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Classification
| Nickel-Strunz (10th) | 3.AB.10Wikidata (CC0) |
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| Nickel-Strunz (9th) | 3.AB.10Wikidata (CC0) |
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