European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 33, issue 3
Articles | Volume 33, issue 3
https://doi.org/10.5194/ejm-33-329-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-33-329-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 33, issue 3
Research article
 | 
29 Jun 2021
Research article |  | 29 Jun 2021

Sequential dehydration of the phosphate–sulfate association from Gura Dobrogei Cave, Dobrogea, Romania

Delia-Georgeta Dumitraş and Ştefan Marincea

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Short summary
The low-temperature transformations of phosphate and sulfate sequences in the fossil guano from a Romanian cave were investigated using a mineralogical and chemical approach, resulting in the finding of a quite exotic mineral association, including the rare minerals francoanellite and monetite. The dehydration process of primary guano minerals seems driven by exothermic reactions at local scale (e.g., oxidation of ammonia, organic matter, allogenic pyrite or other organic compounds).
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