Bararite
(NH4)2SiF6IMA symbol: Brrgrandfathered
Bararite is a halide mineral with the formula (NH4)2SiF6, crystallizing in the trigonal system. It has a calculated density of 2.033 g/cm3.
Crystallography
| Crystal system | trigonal crystal systemWikidata (CC0) |
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| Space group | P -3 m 1 |
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| Cell (Å, °) | a = 5.784, b = 5.784, c = 4.796; α = 90, β = 90, γ = 120 |
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| Cell volume | 138.953 ų, Z = 1 |
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| Axial ratios | 1.0000:1:0.8292calculated from COD 9012469 |
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| Source structure | COD 9012469 (Journal of Chemical Physics, 1966) — 1 of 2 structures |
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Powder X-ray diffraction (calculated)
| d (Å) | 5.009 | 2.22 | 3.464 | 4.796 | 1.732 | 1.486 |
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| I/I₀ | 100 | 68.7 | 54.2 | 22.8 | 16.8 | 14.2 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012469; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.033 g/cm³calculated from COD 9012469 |
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Chemistry (calculated)
| Molecular weight | 178.15 g/molcalculated from the IMA formula |
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| Composition (wt%) | N 15.72%, H 4.53%, Si 15.76%, F 63.98% |
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Classification
| Nickel-Strunz (10th) | 3.CH.10Wikidata (CC0) |
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| Nickel-Strunz (9th) | 3.CH.10Wikidata (CC0) |
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