| Reference Type | Journal (article/letter/editorial) |
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| Title | The crystal structure of dalnegroite, Tl5−xPb2x(As,Sb)21−xS34: a masterpiece of structural complexity |
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| Journal | Mineralogical Magazine |
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| Authors | Bindi, L. | Author |
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| Nestola, F. | Author |
| Guastoni, A. | Author |
| Secco, L. | Author |
| Year | 2010 (December) | Volume | 74 |
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| Page(s) | 999-1012 | Issue | 6 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM74_999.pdf+ |
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| DOI | doi:10.1180/minmag.2010.074.6.999Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244126 | Long-form Identifier | mindat:1:5:244126:3 |
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| GUID | 56d81b0d-b47a-49fd-961c-66c1ba9a5493 |
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| Full Reference | Bindi, L., Nestola, F., Guastoni, A., Secco, L. (2010) The crystal structure of dalnegroite, Tl5−xPb2x(As,Sb)21−xS34: a masterpiece of structural complexity. Mineralogical Magazine, 74 (6) 999-1012 doi:10.1180/minmag.2010.074.6.999 |
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| Plain Text | Bindi, L., Nestola, F., Guastoni, A., Secco, L. (2010) The crystal structure of dalnegroite, Tl5−xPb2x(As,Sb)21−xS34: a masterpiece of structural complexity. Mineralogical Magazine, 74 (6) 999-1012 doi:10.1180/minmag.2010.074.6.999 |
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| Abstract/Notes | The crystal structure of the rare mineral dalnegroite, Tl5−xPb2x(As,Sb)21−xS34 with x ≈ 1, was determined for a crystal from Lengenbach, Binn Valley, Switzerland. The structure is triclinic, space group P1, with a = 16.218(3), b = 42.546(7), c = 8.558(1) Å , α = 95.70(4), β = 90.18(3), γ = 96.38(4)°, V = 5838.9(9) Å3, Z = 4. Refinement of an isotropic model led to an R1 index of 0.0536 for 22226 observed reflections and 980 parameters, and R1 = 0.0590 for all 25266 independent reflections. Although dalnegroite cannot be considered a layered compound, its structure can be usefully described as a regular alternation of two kinds of layers stacked along the b axis, with four layers in the unit cell: (1) a layer 7.8 Å thick, at y ≈ 0.15 and 0.65, can be considered as derived from the SnS archetype; (2) a layer 13.6 Å thick, at y ≈ 0.35 and 0.85, derived from the PbS archetype. Different chemical compositions, such as Tl:Pb and Sb:As ratios, for different samples belonging to the chabournéite-dalnegroite family could play a central role in controlling different degrees of order, leading to different superstructures. |
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