Grey, I. E., Scarlett, N. V. Y., Brand, H. E. A. (2013) Crystal chemistry and formation mechanism of non-stoichiometric monoclinic K-jarosites. Mineralogical Magazine, 77 (3) 249-268 doi:10.1180/minmag.2013.077.3.03
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Crystal chemistry and formation mechanism of non-stoichiometric monoclinic K-jarosites | ||
| Journal | Mineralogical Magazine | ||
| Authors | Grey, I. E. | Author | |
| Scarlett, N. V. Y. | Author | ||
| Brand, H. E. A. | Author | ||
| Year | 2013 (April) | Volume | 77 |
| Issue | 3 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2013.077.3.03Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 244385 | Long-form Identifier | mindat:1:5:244385:4 |
| GUID | 0 | ||
| Full Reference | Grey, I. E., Scarlett, N. V. Y., Brand, H. E. A. (2013) Crystal chemistry and formation mechanism of non-stoichiometric monoclinic K-jarosites. Mineralogical Magazine, 77 (3) 249-268 doi:10.1180/minmag.2013.077.3.03 | ||
| Plain Text | Grey, I. E., Scarlett, N. V. Y., Brand, H. E. A. (2013) Crystal chemistry and formation mechanism of non-stoichiometric monoclinic K-jarosites. Mineralogical Magazine, 77 (3) 249-268 doi:10.1180/minmag.2013.077.3.03 | ||
| Abstract/Notes | AbstractSyntheses in acidified hydrothermal (HT) solutions (1 N H2SO4 or stronger) produce monoclinic non-stoichiometric K-jarosites which contain Fe-site vacancies with long-range order. Syntheses in non-acidified HT solutions produce rhombohedral K-jarosites which contain relatively large numbers of Fe-site vacancies with no long-range order. Increasing the [Fe]/[K] ratio, reaction temperature and reaction time in non-acidified solutions promotes the formation of monoclinic jarosites which contain Fe-site vacancies with short-range order. A structural model including details of the ordering of the Fe-site vacancies was obtained by refinement of single-crystal synchrotron data from one of the HT synthesis products; this model was used to refine synchrotron powder X-ray diffraction data from products synthesized at different reaction times, temperatures and [Fe]/[K] ratios. Thermal and chemical analyses are consistent with a model for non-stoichiometry in which domains of stoichiometric jarosite are intergrown with butlerite-like iron-deficient domains with a composition [Fe2(SO4)2(OH)2(H2O)4]. It was found that heterogeneous nucleation of monoclinic jarosite on Si disks is preceded by the formation of an oriented film of Maus's Salt, K5Fe3O(SO4)6·10H2O, as a precursor phase, and that this transforms topotactically into oriented jarosite, which contains butlerite-like layers parallel to the disk surface. Structural models for the transformation of Maus's Salt into jarosite are proposed. | ||
Mineral Pages
| Mineral | Citation Details |
|---|---|
| Jarosite |
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