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Leguernite, Bi12.67O14(SO4)5, a new Bi oxysulfate from the fumarole deposit of La Fossa crater, Vulcano, Aeolian Islands, Italy

Published online by Cambridge University Press:  05 July 2018

Anna Garavelli ,
Daniela Pinto ,
Donatella Mitolo  and
Luca Bindi
Anna Garavelli*
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Universitá degli Studi di Bari “A. Moro”, via E. Orabona 4, I-70125 Bari, Italy
Daniela Pinto
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Universitá degli Studi di Bari “A. Moro”, via E. Orabona 4, I-70125 Bari, Italy
Donatella Mitolo
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Universitá degli Studi di Bari “A. Moro”, via E. Orabona 4, I-70125 Bari, Italy
Luca Bindi
Affiliation:
Dipartimento di Scienze della Terra, Universitá degli Studi di Firenze, via G. La Pira 4, I-50121 Florence, Italy
*
* E-mail: anna.garavelli@uniba.it
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Abstract

Leguernite, ideally Bi12.67O14(SO4)5, is a new mineral found in high-temperature fumarolic assemblages at La Fossa crater, Vulcano, Aeolian Islands, Italy. It occurs as aggregates of needleshaped crystals associated strictly with anglesite, balićžunićite and an unknown Bi sulfate. Leguernite is colourless to white, transparent, non-fluorescent, has a sub-adamantine lustre and a white streak. Electron microprobe data led to the chemical formula (on the basis of 34 anions p.f.u.) (Bi12.40Pb0.15)Σ=12.55S5.08O34. The calculated density is 7.375 g cm–3. A Raman spectrum collected on a single crystal of leguernite confirmed the anhydrous nature of the mineral.

Leguernite is monoclinic, space group P2, with a = 11.2486(11), b = 5.6568(6), c = 11.9139(10) Å , β = 99.177(7)º, V = 748.39(12) Å3 and Z = 1. The crystal structure is built up of Bi–O blocks of a fluorite-like structure with Bi12O14 composition separated by a single sulfate ion along [100] and by Bi(SO4)45– groups along [101]. It can also be described as composed of (001) layers with composition [Bi12O14(SO4)6+]n alternating with layers of composition [Bi(SO4)4]n5– along [001]. Leguernite shows significant similarities with the synthetic Bi14O16(SO4)5 compound.

The eight strongest reflections in the powder X-ray diffraction data [d in Å (I) (hkl)] are: 3.220 (100) (013), 3.100 (95) (11), 2.83 (30) (020), 2.931 (25) (302), 2.502 (25) (04), 2.035 (20) (322), 1.875 (20) (24) and 5.040 (15) (110).

The name is in honour of Franc¸ois “Fanfan” Le Guern (1942–2011), who was a very active volcanologist and specialist in volcanic gases and sublimates. Both the mineral and the mineral name have been approved by the IMA-CNMNC (2013–051).

Keywords

leguerniteBi oxysulfatenew mineralfumarole sublimatesVulcanofluorite-related crystal structureAeolian IslandsItaly
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 7 , December 2014 , pp. 1629 - 1645
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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