Tincalconite
Na2B4O5(OH)4·3H2OIMA symbol: Tncgrandfathered
Tincalconite is a borate mineral with the formula Na2B4O5(OH)4·3H2O, crystallizing in the trigonal system. It has a calculated density of 1.866 g/cm3.
Crystallography
| Crystal system | trigonal crystal systemWikidata (CC0) |
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| Space group | R 3 2 :H |
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| Cell (Å, °) | a = 11.1402, b = 11.1402, c = 21.207; α = 90, β = 90, γ = 120 |
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| Cell volume | 2279.27 ų, Z = 9 |
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| Axial ratios | 1.0000:1:1.9036calculated from COD 9002675 |
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| Source structure | COD 9002675 (American Mineralogist, 2002) — 1 of 2 structures |
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Powder X-ray diffraction (calculated)
| d (Å) | 2.927 | 4.391 | 3.448 | 8.782 | 4.375 | 2.188 |
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| I/I₀ | 100 | 59.3 | 58 | 50.8 | 35.4 | 32.2 |
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xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002675; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 1.866 g/cm³calculated from COD 9002675 |
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Chemistry (calculated)
| Molecular weight | 291.3 g/molcalculated from the IMA formula |
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| Composition (wt%) | Na 15.78%, B 14.85%, O 65.91%, H 3.46% |
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Classification
| Nickel-Strunz (10th) | 6.DA.15Wikidata (CC0) |
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| Nickel-Strunz (9th) | 6.DA.15Wikidata (CC0) |
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