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Minerals, Volume 11, Issue 1

January 2021 - 94 articles

Cover Story: This paper deals with salt weathering of limestones by capillary water and water lixiviated from pigeon droppings. Formation of gypsum, hexahydrite, halite, aphthitalite, and arcanite is associated with capillary water, and niter, hydroxyapatite, brushite, struvite, weddellite, oxammite, and halite with pigeon droppings. Humberstonite is related to the interaction of both types of waters. Analysis of crystal shapes reveals different saturation degree conditions. Single salts show non-equilibrium shapes, implying higher crystallization pressures. Single salts have undergone dissolution–dehydration processes enhancing the deterioration process. Double salts have crystals corresponding to near-equilibrium form, implying lower crystallization pressures. This geochemical study suggests salts precipitate via incongruent reactions. View this paper
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Minerals - ISSN 2075-163X