Guérinite Ca<sub>6</sub>(HAsO<sub>4</sub>)<sub>3</sub>(AsO<sub>4</sub>)<sub>2</sub>∙10.5H<sub>2</sub>O – a revision of the mineral formula
- Autor(en)
- Irene Liebhart, Branko Rieck, Gerald Giester
- Abstrakt
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.- Organisation(en)
- Institut für Mineralogie und Kristallographie
- Journal
- Mineralogy and Petrology
- Band
- 118
- Seiten
- 547-554
- Anzahl der Seiten
- 8
- ISSN
- 0930-0708
- DOI
- https://doi.org/10.1007/s00710-024-00873-2
- Publikationsdatum
- 10-2024
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105116 Mineralogie, 105113 Kristallographie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Geochemistry and Petrology, Geophysics
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/a3103ca0-51a4-477e-ba82-f6413e7ff9f3