Kernowite, Cu2Fe(AsO4)(OH)4.4H2O, the Fe3+ - analogue of liroconite from Cornwall, UK

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F21%3A10135260" target="_blank" >RIV/00023272:_____/21:10135260 - isvavai.cz</a>
Result on the web
<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/kernowite-cu2feaso4oh44h2o-the-fe3analogue-of-liroconite-from-cornwall-uk/73553D6A8105CD0781A942A486CE02D2" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/kernowite-cu2feaso4oh44h2o-the-fe3analogue-of-liroconite-from-cornwall-uk/73553D6A8105CD0781A942A486CE02D2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1180/mgm.2021.40" target="_blank" >10.1180/mgm.2021.40</a>

Result language
angličtina
Original language name
Kernowite, Cu2Fe(AsO4)(OH)4.4H2O, the Fe3+ - analogue of liroconite from Cornwall, UK
Original language description
The occurrence, chemical composition and structural characterisation of the new mineral kernowite, ideally Cu2Fe(AsO4)(OH)4.4H2O, the Fe3+ - analogue of liroconite, Cu2Al(AsO4)(OH)4.4H2O, are described. Kernowite (IMA2020-053) occurs on specimens probably sourced from the Wheal Gorland mine, St Day, Cornwall, UK, in the cavities of a quartz-gossan rich in undifferentiated micro-crystalline grey sulfides and poorly crystalline arsenic phases including both pharmacosiderite and olivenite-group minerals. The average composition of kernowite determined from several holotype fragments by electron microprobe analysis is Cu1.88(Fe0.79Al0.09)Σ0.88(As1.12O4)(OH)4.3.65H2O. The structure of kernowite has been determined in monoclinic space group I2/ a (a non-standard setting of C2/c) by single-crystal X-ray diffraction (SCXRD) to R1 = 0.025, wR2 = 0.051 and Goodness-of-fit = 1.112. Unit-cell parameters from SCXRD are a = 12.9243(4) Å, b = 7.5401(3) Å, c = 10.0271(3) Å, β = 91.267(3)o, V = 976.91(6) Å 3 and Z = 4. The chemical formula of this crystal indicated by SCXRD from refined site-scattering is Cu2(Fe3+0.84Al0.16)AsO4(OH)4.4H2O. The network of hydrogen bonding has been determined and is similar to that reported for liroconite from Wheal Gorland by Plumhoff et al. (2020).
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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