Bindi, Luca, Morana, Marta (2021) Twinning, Superstructure and Chemical Ordering in Spryite, Ag8(As3+0.50As5+0.50)S6, at Ultra-Low Temperature: An X-Ray Single-Crystal Study. Minerals, 11 (3) 286 doi:10.3390/min11030286
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Twinning, Superstructure and Chemical Ordering in Spryite, Ag8(As3+0.50As5+0.50)S6, at Ultra-Low Temperature: An X-Ray Single-Crystal Study | ||
| Journal | Minerals | ||
| Authors | Bindi, Luca | Author | |
| Morana, Marta | Author | ||
| Year | 2021 (March 10) | Volume | 11 |
| Page(s) | 286 | Issue | 3 |
| Publisher | MDPI AG | ||
| URL | |||
| Download URL | https://www.mdpi.com/2075-163X/11/3/286/pdf?version=1615385090 | ||
| DOI | doi:10.3390/min11030286Search in ResearchGate | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 13422377 | Long-form Identifier | mindat:1:5:13422377:5 |
| GUID | c3fa1c9b-fd79-4170-a411-172c71571a4d | ||
| Full Reference | Bindi, Luca, Morana, Marta (2021) Twinning, Superstructure and Chemical Ordering in Spryite, Ag8(As3+0.50As5+0.50)S6, at Ultra-Low Temperature: An X-Ray Single-Crystal Study. Minerals, 11 (3) 286 doi:10.3390/min11030286 | ||
| Plain Text | Bindi, Luca, Morana, Marta (2021) Twinning, Superstructure and Chemical Ordering in Spryite, Ag8(As3+0.50As5+0.50)S6, at Ultra-Low Temperature: An X-Ray Single-Crystal Study. Minerals, 11 (3) 286 doi:10.3390/min11030286 | ||
| In | (2021, March) Minerals Vol. 11 (3) MDPI AG | ||
| Abstract/Notes | Spryite (Ag7.98Cu0.05)Σ=8.03(As5+0.31Ge0.36As3+0.31Fe3+0.02)Σ=1.00S5.97, and ideally Ag8(As3+0.5As5+0.5)S6, is a new mineral recently described from the Uchucchacua polymetallic deposit, Oyon district, Catajambo, Lima Department, Peru. Its room temperature structure exhibits an orthorhombic symmetry, space group Pna21, with lattice parameters a = 14.984(4), b = 7.474(1), c = 10.571(2) Å, V = 1083.9(4) Å3, Z = 4, and shows the coexistence of As3+ and As5+ distributed in a disordered fashion in a unique mixed position. To analyze the crystal-chemical behaviour of the arsenic distribution at ultra-low temperatures, a structural study was carried out at 30 K by means of in situ single-crystal X-ray diffraction data (helium-cryostat) on the same sample previously characterized from a chemical and structural point of view. At 30 K, spryite still crystallizes with orthorhombic symmetry, space group Pna21, but gives rise to a a × 3b × c superstructure, with a = 14.866(2), b = 22.240(4), c = 10.394(1) Å, V = 3436.5(8) Å3 and Z = 4 (Ag24As3+As5+Ge4+S18 stoichiometry). The twin laws making the twin lattice simulating a perfect hexagonal symmetry have been taken into account and the crystal structure has been solved and refined. The refinement of the structure leads to a residual factor R = 0.0329 for 4070 independent observed reflections [with Fo > 4σ(Fo)] and 408 variables. The threefold superstructure arises from the ordering of As3+ and (As5+, Ge4+) in different crystal-chemical environments. | ||
References Listed
These are the references the publisher has listed as being connected to the article. Please check the article itself for the full list of references which may differ. Not all references are currently linkable within the Digital Library.
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Mineral Pages
| Mineral | Citation Details |
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| Spryite |
See Also
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