| Reference Type | Journal (article/letter/editorial) |
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| Title | New Members of the Hydrotalcite-Manasseite Group |
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| Journal | Clays and Clay Minerals |
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| Authors | Drits, V. A. | Author |
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| Sokolova, T. N. | Author |
| Sokolova, G. V. | Author |
| Cherkashin, V. I. | Author |
| Year | 1987 (December) | Volume | 35 |
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| Page(s) | 401-417 | Issue | 6 |
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| Publisher | Cambridge University Press (CUP) |
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| URL | |
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| DOI | doi:10.1346/ccmn.1987.0350601Search 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 | 146329 | Long-form Identifier | mindat:1:5:146329:7 |
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| GUID | 0 |
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| Full Reference | Drits, V. A., Sokolova, T. N., Sokolova, G. V., Cherkashin, V. I. (1987) New Members of the Hydrotalcite-Manasseite Group. Clays and Clay Minerals, 35 (6). 401-417 doi:10.1346/ccmn.1987.0350601 |
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| Plain Text | Drits, V. A., Sokolova, T. N., Sokolova, G. V., Cherkashin, V. I. (1987) New Members of the Hydrotalcite-Manasseite Group. Clays and Clay Minerals, 35 (6). 401-417 doi:10.1346/ccmn.1987.0350601 |
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| In | (1987) Clays and Clay Minerals Vol. 35 (6) Springer Science and Business Media LLC |
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| Abstract/Notes | AbstractSeveral new minerals, structurally and chemically similar to the hydrotalcite-manasseite group, have been found in the saline deposits of the central pre-Caspian depression and in those of Middle Asia. Their structures consist of layers of (Mg1-xAlx)(OH)2 plus interlayers of anions and molecular water. In addition to manasseite itself, [(Mg4Al2)(OH)12][(CO3)-3H2O], having unit-cell parameters of a = 3.042, c = 2 × 7.56= 15.12 Å and a calculated density of Dc = 2.15 g/cm3, other varieties were identified whose interlayers contain alternately SO42− or SO42− and CO32− anions. The following new phases were recognized: (1) an 8.85-Å phase having the composition [(Mg4Al2)(OH)12][(SO4)·3H2O], subcell dimensions of a' = 3.04, c' = 8.85 Å, and Dc = 1.96 g/cm3; (2) an 11-Å phase having the composition [(Mg3.96Fe0.06Al1.98)(OH)12][Na0.56(SO4)1.30·7.3H2O], hexagonal unit-cell parameters of a = √3 · 3.042 = 5.28 Å, c = 11.16 Å, and Dc = 1.90 g/cm3; (3) a 16.5-Å mixed-layer phase having the composition [(Mg4Al2)(OH)12][(SO4)0.5(CO3)0.5·3H2O] and an ordered ABAB... alternation of 7.56-Å layers (i.e., a brucite-like layer + a CO32−-containing interlayer) and 8.94-Å layers containing SO42− anions in interlayers; this phase has unit-cell dimensions of a' = 3.05, c' = 16.5 Å and Dc = 2.06 g/cm3; and (4) an 18.5-Å ordered mixed-layer phase having the ideal composition [(Mg8Al4)(OH)24][M+0.5(SO4)1.25(CO3)1.0·9H2O] and an alternation of 7.56-Å, CO3-containing layers and 11-Å layers having SO42− anions and Na and Mg cations in interlayers (M+0.5 corresponds to interlayer cations). This last phase has unit-cell dimensions of a = 3.046, c = 3 × 18.54 = 55.62 Å and Dc = 1.99 g/cm3. Some of the varieties containing SO42− in the interlayers swelled with ethylene glycol or glycerol.For this diverse family of minerals whose structures are based on brucite-like layers of the composition (R2+1-xR3+x)(OH)2, a unifying system of nomenclature is offered for consideration. In describing these brucite-like structures intercalated with anion- and cation-containing interlayers, the composition of the hydroxide sheet and the interlayers, the periodicity of the layers, and the mixed-layer nature of the material should be described. By means of symbols, a single term might be used to describe the crystal chemistry of any member of the group having a given cation composition for the brucite-like layers, for example, manasseite, a 2H polytype of hydrotalcite that has a repeat distance of 7.56 Å and CO3-containing interlayers, might be designated as 7.56-Å CO3-hydrotalcite-2H. |
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