Polytypism of natural sphalerite and its typomorphic significance

Platonov, A. N.; Shadlun, T. N.; Polyakova, O. P.; Dobrovol’skaya, M. G.

doi:10.1080/00206817109475543

Cited by 1 publication

(2 citation statements)

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“…Chao and Gault, 1998;Hollenbaugh and Carlson, 1983). Moreover, the degree of hexagonality of sphalerites from different localities was found to correlate with Fe content, and the correlation patterns for epithermal sphalerites were different from those discovered in higher temperature deposits (Platonov et al, 1969). The data available are insuf cient to identify which type of structure variation does take place in (Zn,Fe)S sphalerites.…”

Section: Fig 6 (A) a Comparison Of Lattice Parameters Formentioning

confidence: 90%

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Thermodynamics of (Zn,Fe)S sphalerite. A CVM approach with large basis clusters

Balabin

Sack

2000

Mineral. mag.

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We have developed a cluster variation method (CVM) model based on cuboctahedral and octahedral basis clusters containing 13 and 6 atoms, respectively, and applied it to the analysis of the thermodynamic mixing properties of (Zn,Fe)S solid solutions. The model, in which the internal energy of the lattice is approximated by next to nearest neighbour (nnn) pair interactions and many-body interactions associated with nearest neighbour (nn) equilateral triangles, describes the FeS contents of sphalerites equilibrated with pyrrhotite and pyrite, and with pyrrhotite and iron metal within experimental uncertainties. The model predicts moderate deviations from ideality; the mean values of the Lewis and Randall activity coefficient of FeS and ZnS are, 1.48 and 1.03, respectively. Predictions of the model are in qualitative agreement with cell-edge data. The model also predicts that sphalerites undergo long-range ordering to lower-symmetry structures at temperatures only slightly below those investigated experimentally, a result in agreement with inferences from an existing Mössbauer investigation of synthetic sphalerites.More realistic models in which interactions are ascribed to larger species (nn triangular and centred square species) predict that such long-range ordering occurs at even higher temperatures and underscore the need for better characterization of the structures of (Zn,Fe)S minerals.

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Section: Fig 6 (A) a Comparison Of Lattice Parameters Formentioning

confidence: 90%

“…constructed in all the polytypes of ZnS including discovered in higher temperature deposits (Platonov et al, 1969). The data available are insuf cient to identify which type of structure variation does take place in (Zn,Fe)S sphalerites.…”

Section: Thermodynamics Of Sphalerite: a Cvm Approachmentioning

confidence: 99%

Thermodynamics of (Zn,Fe)S sphalerite. A CVM approach with large basis clusters

Balabin

Sack

2000

Mineral. mag.

View full text Add to dashboard Cite

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Polytypism of natural sphalerite and its typomorphic significance

Cited by 1 publication

References 5 publications

Thermodynamics of (Zn,Fe)S sphalerite. A CVM approach with large basis clusters

Thermodynamics of (Zn,Fe)S sphalerite. A CVM approach with large basis clusters

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