{"title":"Guérinite Ca6(HAsO4)3(AsO4)2∙10.5H2O – a revision of the mineral formula","authors":"Irene Liebhart, Branko Rieck, Gerald Giester","doi":"10.1007/s00710-024-00873-2","DOIUrl":null,"url":null,"abstract":"<div><p>A single crystal of guérinite from the Plaka Mine, Lavrion, Greece, was examined by X-ray diffraction. The mineral crystallizes in the monoclinic space group <i>P</i>2<sub>1</sub>/<i>n</i> with unit cell parameters <i>a</i> = 17.628 (2), <i>b</i> = 6.728 (1), <i>c</i> = 23.384 (3) Å, <i>β</i> = 90.68 (1)°, <i>V</i> = 2773.4 (6) Å<sup>3</sup>. The originally reported mineral formula Ca<sub>5</sub>(HAsO<sub>4</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>∙9H<sub>2</sub>O, Z = 5 should be revised to Ca<sub>6</sub>(HAsO<sub>4</sub>)<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>∙10.5H<sub>2</sub>O, Z = 4. Accordingly, guérinite is no longer considered a polymorph to ferrarisite. The structure is characterized by complex layers consisting of corner- and edge sharing of CaO<sub>n</sub> (<i>n</i> = 7, 8) polyhedra and arsenate groups. The connection between these units is achieved exclusively via hydrogen bonding.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"118 4","pages":"547 - 554"},"PeriodicalIF":1.4000,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-024-00873-2.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mineralogy and Petrology","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s00710-024-00873-2","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
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Abstract
A single crystal of guérinite from the Plaka Mine, Lavrion, Greece, was examined by X-ray diffraction. The mineral crystallizes in the monoclinic space group P21/n with unit cell parameters a = 17.628 (2), b = 6.728 (1), c = 23.384 (3) Å, β = 90.68 (1)°, V = 2773.4 (6) Å3. The originally reported mineral formula Ca5(HAsO4)2(AsO4)2∙9H2O, Z = 5 should be revised to Ca6(HAsO4)3(AsO4)2∙10.5H2O, Z = 4. Accordingly, guérinite is no longer considered a polymorph to ferrarisite. The structure is characterized by complex layers consisting of corner- and edge sharing of CaOn (n = 7, 8) polyhedra and arsenate groups. The connection between these units is achieved exclusively via hydrogen bonding.
期刊介绍：
Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered.
Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.
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