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Minerals, Volume 10, Issue 7
July 2020 - 68 articles
Cover Story: This paper analyses the mineralogical composition, texture and structure of a stalactite sampled from the city-wall storerooms of the Nueva Tabarca fortress (SE Spain). This speleothem presents an uncommon mineral assemblage: aragonite, brucite, gypsum, silica and halite. Internally, it shows a complex structure: 1) a central soda-straw composed by aragonite; 2) an external puff-pastry cone-crust formed preferentially by aragonite and brucite; and 3) an internal branching of coralloids, showing a subtle layering between brucite and aragonite. PHREEQC calculations showed that interaction between pore waters and the minerals of mortar aggregates of the city-wall (dolomite, pyroxene and amphibole) leads to rich-magnesium solutions. Evaporation modelling of lixiviated waters describes the precipitation of the mineral assemblage of the brucite–aragonite speleothems. View this paper
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Minerals - ISSN 2075-163XCreative Common CC BY license