| Reference Type | Journal (article/letter/editorial) |
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| Title | Crystal chemistry of natural layered double hydroxides. I. Quintinite-2H-3c from the Kovdor alkaline massif, Kola peninsula, Russia |
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| Journal | Mineralogical Magazine |
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| Authors | Krivovichev, S. V. | Author |
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| Yakovenchuk, V. N. | Author |
| Zhitova, E. S. | Author |
| Zolotarev, A. A. | Author |
| Pakhomovsky, Y. A. | Author |
| Ivanyuk, G. Yu. | Author |
| Year | 2010 (October) | Volume | 74 |
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| Issue | 5 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2010.074.5.821Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244104 | Long-form Identifier | mindat:1:5:244104:1 |
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| GUID | 0 |
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| Full Reference | Krivovichev, S. V., Yakovenchuk, V. N., Zhitova, E. S., Zolotarev, A. A., Pakhomovsky, Y. A., Ivanyuk, G. Yu. (2010) Crystal chemistry of natural layered double hydroxides. I. Quintinite-2H-3c from the Kovdor alkaline massif, Kola peninsula, Russia. Mineralogical Magazine, 74 (5) 821-832 doi:10.1180/minmag.2010.074.5.821 |
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| Plain Text | Krivovichev, S. V., Yakovenchuk, V. N., Zhitova, E. S., Zolotarev, A. A., Pakhomovsky, Y. A., Ivanyuk, G. Yu. (2010) Crystal chemistry of natural layered double hydroxides. I. Quintinite-2H-3c from the Kovdor alkaline massif, Kola peninsula, Russia. Mineralogical Magazine, 74 (5) 821-832 doi:10.1180/minmag.2010.074.5.821 |
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| Abstract/Notes | The crystal structure of quintinite-2H-3c, [Mg4Al2(OH)12](CO3)(H2O)3, from the Kovdor alkaline massif, Kola peninsula, Russia, was solved by direct methods and refined to an agreement index (R1) of 0.055 for 484 unique reflections with |Fo| ≥ 4σF. The mineral is rhombohedral, R32, a = 5.2745(7), c = 45.36(1) Å. The diffraction pattern of the crystal has strong and sharp Bragg reflections having h–k = 3n and l = 3n and lines of weak superstructure reflections extended parallel to c* and centred at h–k ≠3n. The structure contains six layers within the unit cell with the layer stacking sequence of …AC=CA=AC=CA=AC=CA… The Mg and Al atoms are ordered in metal hydroxide layers to form a honeycomb superstructure. The full superstructure is formed by the combination of two-layer stacking sequence and Mg-Al ordering. This is the first time that a long-range superstructure in carbonate-bearing layered double hydroxide (LDH) has been observed. Taking into account Mg-Al ordering, the unique layer sequence can be written as …=Ab1C=Cb1A=Ab2C=Cb2A=Ab3C=Cb3A=… The use of an additional suffix is proposed in order to distinguish between LDH polytypes having the same general stacking sequence but with different c parameters compared with the ‘standard’ polytype. According to this notation, the quintinite studied here can be described as quintinite-2H-3c or quintinite-2H-3c[6R], indicating the real symmetry. |
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