Lópezite
K2Cr2O7IMA symbol: Lpzrenamed
Lópezite is a sulfate mineral with the formula K2Cr2O7, crystallizing in the triclinic system. It has a calculated density of 2.694 g/cm3.
Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
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| Space group | P -1 |
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| Cell (Å, °) | a = 7.3807, b = 7.4593, c = 13.391; α = 96.205, β = 98.033, γ = 90.914 |
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| Cell volume | 725.368 ų, Z = 4 |
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| Axial ratios | 0.9895:1:1.7952calculated from COD 9011306 |
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| Source structure | COD 9011306 (Acta Crystallographica, Section B: Structural Science, 2004) — 1 of 3 structures |
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Powder X-ray diffraction (calculated)
| d (Å) | 3.294 | 3.468 | 4.867 | 3.652 | 3.002 | 2.873 |
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| I/I₀ | 100 | 99.1 | 48.6 | 45.4 | 45.2 | 44.1 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011306; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.694 g/cm³calculated from COD 9011306 |
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Chemistry (calculated)
| Molecular weight | 294.18 g/molcalculated from the IMA formula |
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| Composition (wt%) | K 26.58%, Cr 35.35%, O 38.07% |
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Classification
| Nickel-Strunz (10th) | 7.FD.05Wikidata (CC0) |
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| Nickel-Strunz (9th) | 7.FD.05Wikidata (CC0) |
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