Tinaksite
K2NaCa2TiSi7O18(OH)OIMA symbol: Tnkapproved
Tinaksite is a silicate mineral with the formula K2NaCa2TiSi7O18(OH)O. It has a calculated density of 2.824 g/cm3. Its streak is white.
Crystallography
| Space group | P -1 |
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| Cell (Å, °) | a = 10.377, b = 12.166, c = 7.059; α = 90.91, β = 99.3, γ = 92.76 |
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| Cell volume | 878.187 ų, Z = 2 |
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| Axial ratios | 0.8530:1:0.5802calculated from COD 9007636 |
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| Source structure | COD 9007636 (Acta Crystallographica, Section B, 1980) |
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Powder X-ray diffraction (calculated)
| d (Å) | 10.227 | 1.764 | 3.098 | 3.144 | 3.023 | 3.033 |
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| I/I₀ | 100 | 56.1 | 53.9 | 53.9 | 52.8 | 45.9 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007636; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.824 g/cm³calculated from COD 9007636 |
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| Streak | whitesingle sourceWikidata (CC0) |
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Chemistry (calculated)
| Molecular weight | 746.8 g/molcalculated from the IMA formula |
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| Composition (wt%) | K 10.47%, Na 3.08%, Ca 10.73%, Ti 6.41%, Si 26.33%, O 42.85%, H 0.13% |
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Classification
| Nickel-Strunz (10th) | 9.DG.75Wikidata (CC0) |
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| Nickel-Strunz (9th) | 9.DG.75Wikidata (CC0) |
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