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Title: Guérinite Ca6(HAsO4)3(AsO4)2∙10.5H2O – a revision of the mineral formula.
Authors: Liebhart, Irene; Rieck, Branko; Giester, Gerald
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.
Subjects: SPACE groups; UNIT cell; HYDROGEN bonding; SINGLE crystals; X-ray diffraction; ARSENATES
Publication: Mineralogy & Petrology, 2024, Vol 118, Issue 4, p547
ISSN: 0930-0708
Publication type: Academic Journal
DOI: 10.1007/s00710-024-00873-2

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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.