The crystal structure of ganophyllite, a complex manganese aluminosilicate. I. Polytypism and strutural variation

Jefferson, D. A.

doi:10.1107/s0567739478001060

Cited by 12 publications

(6 citation statements)

References 7 publications

(10 reference statements)

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“…Although noting the close similarity between the observed powder patterns for eggletonite and the strong subcell reflections of ganophyllite, Peacor et aL were unable to detect superlattice reflections in eggletonite. Such reflections are known to occur in ganophyllite (Smith and Frondel, 1968;Jefferson, 1978) and produce a supercell with dimensions of a = 3ao, b = 2bo and c = 2Co. Kato (1980) suggested that the superlattice along X develops primarily from alkali cation ordering, whereas Eggleton and Guggenheim (1986) postulate that it is a consequence of the tetrahedral linkage across the interlayer.…”

Section: Copyright the Mineralogical Societymentioning

confidence: 99%

Cation exchange in ganophyllite

Guggenheim

Eggleton

1986

Mineral. mag.

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ABSTRACT. Ganophyllite has been shown to have alkali cation exchange capability. Partial cesium exchange for K + N a in large (> 0"3 ram) grains shows that the exchangeable cations migrate parallel to X, the crystallographic direction for the "interlayer' tunnels. Such exchange capabifity supports the suggestion that the alkali elements are located in zeolite-like sites attached to the sides of the tunnels. Exchange experiments show that complete sodium substitution for potassium is possible also. Eggletonite, the Na analogue of ganophyllite, is shown to have an identical superlattice to ganophyllite, indicating that eggletonite differs from ganophyllite only by the exchangeable cation. KEYWORDS" ganophyllite, eggletonite, cation exchange. THE Mn layer silicate ganophyllite, approximately

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Section: Copyright the Mineralogical Societymentioning

confidence: 99%

Cation exchange in ganophyllite

Guggenheim

Eggleton

1986

Mineral. mag.

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“…Smith and Frondel (I968) provided unit cell data for Franklin ganophyllite and proved that some of the material formerly called ganophyllite (Foshag, 1936) was a separate species, now known as bannisterite. Recently, Jefferson (1978) found a triclinic polytype of ganophyllite. The average structure (substructure) has been solved by Kato (1980), who proposed the structural formula (K,Na,Ca)xMn8(Si,A1)I 2(O,OH)3 2(OH)4"nH20 with x = 1-1.5 and n ~> 4.…”

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confidence: 99%

Ganophyllite from Franklin, New Jersey; Pajsberg, Sweden; and Wales new chemical data

et al. 1983

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Ganophyllite from Franklin, New Jersey, Pajsberg, Sweden, and the Benallt Mine, Wales, has been chemically reinvestigated. Twelve new analyses confirm the general structure of Kato (1980) and yield the tentative formula (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32(OH)4·8H2O. There is little solid solution among octahedral cations, and the Si:Al ratio is nearly constant at 10:2. Ca and (Na + K) are apparently differentiated, but all examined ganophyllites are K-rich. Much of the water content is loosely bound and the upper limit of water content is not well defined. Ganophyllite is relatively invariant in chemical composition from locality to locality.

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“…2). The most important XRD feature is the presence of the strongest reflection in the region of 12.3 to 12.6 Å, caused by the thickness of the tetrahedral-octahedral stack and the respective c dimension of the unit cell and subcell (Smith and Frondel, 1968;Jefferson, 1978;Kato, 1980;Guggenheim, 1986, 1994;Heaney et al, 1992). Other known natural alkali-manganese phyllosilicates including shirozulite, zakharovite, shafranovskite, varrenesite, and coombsite markedly differ from middendorfite in crystallography, properties, and composition.…”

Section: Discussionmentioning

confidence: 97%