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Pyroaurite from
Nikka Vord, Baltasound-Haroldswick area, Unst, Shetland, Scotland, UK

Formula:Mg6Fe23+(OH)16[CO3] · 4H2O
Comments:Heddle's identification will have been based on chemical analysis. In the absence of XRD it could be sjögrenite, or a mixture of this and pyroaurite.
References:Heddle, M.F. (1901) Mineralogy of Scotland. vol. 1, p. 111.
Mineral Data:Click here to view Pyroaurite data
Locality Data:Click here to view Nikka Vord, Baltasound-Haroldswick area, Unst, Shetland, Scotland, UK
Nearest other occurrences of Pyroaurite
11.8km (7.3 miles) A Haaf Grunay, Shetland, Scotland, UK
Mineral and/or Locality  
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