Poudretteite
KNa2(B3Si12)O30IMA symbol: Pouapproved
Poudretteite is a silicate mineral with the formula KNa2(B3Si12)O30. It has a calculated density of 2.525 g/cm3. Its streak is white.
Crystallography
| Space group | P 6/m c c |
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| Cell (Å, °) | a = 10.253, b = 10.253, c = 13.503; α = 90, β = 90, γ = 120 |
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| Cell volume | 1229.31 ų, Z = 2 |
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| Axial ratios | 1.0000:1:1.3170calculated from COD 9004192 |
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| Source structure | COD 9004192 (The Canadian Mineralogist, 1987) |
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Powder X-ray diffraction (calculated)
| d (Å) | 5.127 | 3.257 | 2.819 | 2.687 | 2.96 | 4.083 |
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| I/I₀ | 100 | 88.7 | 54.5 | 34.8 | 32.3 | 31.4 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004192; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.525 g/cm³calculated from COD 9004192 |
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| Streak | whitesingle sourceWikidata (CC0) |
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Chemistry (calculated)
| Molecular weight | 934.52 g/molcalculated from the IMA formula |
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| Composition (wt%) | K 4.18%, Na 4.92%, B 3.47%, Si 36.06%, O 51.36% |
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Classification
| Nickel-Strunz (10th) | 9.CM.05Wikidata (CC0) |
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| Nickel-Strunz (9th) | 9.CM.05Wikidata (CC0) |
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