Die chemische Zusammensetzung von Pollucit

Strunz, H.

doi:10.1524/zkri.1936.95.1.1

Cited by 17 publications

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“…The structure of Rb2MgSi50i2 is essentially the same as that of pollucite, CsAlSizOe (Strunz, 1936;Naray-Szabo, 1938;Newnham, 1967) and Cs2BeSi50i2 . It may be described as a 3 D magnesiosilicate framework built of comer-sharing (Mg,Si)04 tetrahedra with the large Rb"^ ions in 12-coordinate cavities.…”

Section: Resultsmentioning

confidence: 87%

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New family of silicate phases with the pollucite structure

Torres-Martı́nez¹,

West²

1986

Zeitschrift Für Kristallographie - Crystalline Materials

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A new family of Silicate phases, Cs2MSisOi2: M = Be, Mg, Fe, Co, Ni, Zn, Cd; RbzMSijOiz: M = Mg, Fe, (Co, Zn) has been prepared with the cubic polludte structure, a in the ränge 13.3 to 13.8 A, Space group Idid, Z = 8. The structure of one, Rb2MgSisOi2, has been refined to R 10.8% using X-ray powder data. The structures are built of a 3D, [MSi50i2]^~ framework containing large, 12-coordinated cavities for the alkali cations. These structures are unusual in that a wide ränge of divalent cations have pardally replaced Si"^"^ in the Silicate anion framework. IntrodoctionPolludte, CsAlSi206, is a framework aluminosilicate containing large, 12-coordinated cavities suitable for occupation by Cs"^ ions (Strunz, 1936; Naray-Szabo, 1938;Newnham, 1967). The unit cell is cubic with space group läid, Z = 16. Similar alumino-silicate frameworks are present in analdte, NaAlSizOe • H2O and leudte, KAlSi206 (Taylor, 1938;Beattie, 1954;Knowles et al., 1965;Wyart, 1941;Deer et al., 1963; Wyckoff, 1968), although leudte is tetragonal below 605° (Wyart, 1941;Deer et al., 1963; Wyckoff, 1968).Structxu-al studies on these phases are complicated by the occurrence of twinning in tetragonal leudte ^azzi et al., 1976) and by Si, AI disorder in the aluminosilicate framework. Various analogues of polludte and leudte, containing other trivalent ions instead of Al^"^ have been reported: Fepolludte, CsFeSi206 (Kopp et al., 1963;Kume and Koizumi, 1965), FeBrought to you by |

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Section: Resultsmentioning

confidence: 87%

“…Polludte, CsAlSi206, is a framework aluminosilicate containing large, 12-coordinated cavities suitable for occupation by Cs"^ ions (Strunz, 1936; Naray-Szabo, 1938;Newnham, 1967). The unit cell is cubic with space group läid, Z = 16.…”

Section: Introdoctionmentioning

confidence: 99%

New family of silicate phases with the pollucite structure

Torres-Martı́nez¹,

West²

1986

Zeitschrift Für Kristallographie - Crystalline Materials

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“…The structure of Rb2MgSis012 is essentially the same as that of pollucite, CsAlSi206 (Strunz, 1936;Naray-Szab6, 1938;Newnham, 1967) and Cs2BeSis012 (Torres-Martinez et aI., 1984). It may be described as a 3D magnesiosilicate framework built of corner-sharing (Mg, Si)04 tetrahedra with the large Rb+ ions in 12-coordinate cavities.…”

Section: Resultsmentioning

confidence: 91%

“…Pollucite, CsAISiz06, is a framework alumino silicate containing large, 12coordinated cavities suitable for occupation by Cs+ ions (Strunz, 1936;Naray-Szabo, 1938;Newnham, 1967). The unit cell is cubic with space group Ia3d, Z = 16.…”

Section: Introductionmentioning

confidence: 99%

New family of silicate phases with the pollucite structure

Torres-Martı́nez¹,

West²

1986

Zeitschrift Für Kristallographie - Crystalline Materials

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A new family of silicate phases, CszMSi5012: M = Be, Mg, Fe, Co, Ni, Zn, Cd; RbzMSi5012: M = Mg, Fe, (Co, Zn) has been prepared with the cubic pollucite structure, a in the range 13.3 to 13.8 A, space group Ia3d, Z = 8. The structure of one, RbzMgSi5012' has been refined to R = 10.8% using X-ray powder data. The structures are built of a 3D, [MSi50u]z-framework containing large, 12-coordinated cavities for the alkali cations. These structures are unusual in that a wide range of divalent cations have partially replaced Si4 + in the silicate anion framework.

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“…The similarity between pollucite and analcime (NaAlSi 2 O 6 ) was demonstrated in 1936, when it was disclosed that the two minerals have the same space group and cell dimensions, as well as similar cell compositions [4]. The positions of silicon, aluminum, and oxygen atoms were subsequently placed according to the analcime framework assuming an Ia 3 3d space group, with cesium ions placed at the 16b ( 1 = 8 , 1 = 8 , 1 = 8 ) site (large site), and water molecules placed at the 24-fold ( 1 = 4 , 1 = 8 , 0) position (small site) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of pollucite

Kamiya¹,

Nishi²,

Yokomori³

2008

Zeitschrift Für Kristallographie

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Pollucite / Single crystal structure analysis / X-ray diffraction / AnalcimeAbstract. The crystal structure of pollucite (ANA) (Cs,Na)AlSi 2 O 6 is characterized by single-crystal X-ray diffractometry. The space group C2/c, monoclinic, is found to be the most probable space group for this mineral based on the systematic absences of reflections. Cesium ions or water molecules are disordered at the center of a channel and are slightly apart from the special position. This is the origin of symmetry breaking and the space group becomes lower from Ia 3 3d (analcime) to C2/c. Sodium ions or vacancies are located at the contact point of the channel. No ordering of aluminum is observed in the pollucite structure.

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Die chemische Zusammensetzung von Pollucit

Cited by 17 publications

References 0 publications

New family of silicate phases with the pollucite structure

New family of silicate phases with the pollucite structure

New family of silicate phases with the pollucite structure

Crystal structure of pollucite

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