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Little is known about the physico-chemical processes that lead to the formation of dolomite in nature. Issues requiring further investigation include: (1) the role played by amorphous carbonate precursors, (2) the mechanisms of transformation of[...]texto impreso
Hydrothermal AFM has been used to study the thermal dehydration reaction on gypsum (010) surfaces in solutions at different saturation states, and in the absence of a bulk liquid phase. Experiments were carried out at temperatures ranging from 2[...]texto impreso
Pérez-Soba Aguilar, Cecilia ; Villaseca González, Carlos ; Fernández, Alfredo | Mineralogical Society of America | 2017-04Three Mn-Fe-rich fluorapatite types have been found in the highly evolved peraluminous and perphosphorous granites of the Belvís pluton. One of these apatite types includes abundant graphite microinclusions, suggestive of a magmatic origin for t[...]texto impreso
Chryssikos, Georgios D. ; Gionis, Vassilis ; Kacandes, Georges H. ; Stathopoulou, Elizabeth T. ; Súarez Barrios, Mercedes ; García Romero, Emilia ; Sánchez del Río, Manuel | Mineralogical Society of America | 2009The OH speciation of 18 palygorskite samples from various localities were evaluated by near infrared spectroscopy (NIR) and compared to the corresponding octahedral composition derived from independent, single-particle analytical electron micros[...]texto impreso
Piña García, Rubén ; Gervilla, Fernando ; Helmy, Hassan ; Fonseca, Raúl O.C. ; Ballhaus, Chris | Mineralogical Society of America | 2020Evidence of immiscibility between arsenide and sulfide melts has been observed both in experimental studies and natural samples from several localities worldwide (e.g., Ronda, Spain; Beni Bousera, Morocco; Dundonald Beach South, Canada). Platinu[...]texto impreso
Roncal-Herrero, Teresa ; Astilleros García-Monge, José Manuel ; Bots, Pieter ; Rodríguez-Blanco, Juan Diego ; Prieto, Manuel ; Benning, Liane G. ; Fernández-Díaz, Lourdes | Mineralogical Society of America | 2017The replacement of sulfate minerals by calcium carbonate polymorphs (carbonation) has important implications in various geological processes occurring in Earth surface environments. In this paper we report the results of an experimental study of[...]texto impreso
Fernández-Díaz, Lourdes ; Pina Martínez, Carlos Manuel ; Astilleros García-Monge, José Manuel ; Sánchez-Pastor, Nuria | Mineralogical Society of America | 2009In this paper, we present an experimental study of the interaction between gypsum (010) surfaces and aqueous solutions of Na2CO3 with different concentrations. This interaction leads to the carbonatation (i.e., the transformation into carbonate [...]texto impreso
Sánchez del Río, Manuel ; García Romero, Emilia ; Súarez Barrios, Mercedes ; Silva, Ivan da ; Fuentes Montero, Luis ; Martínez Criado, Gema | Mineralogical Society of America | 2011Twenty sepiolites of known composition from different origins were analyzed to quantify the variability in structural parameters and its possible relationships with composition and morphology. Morphology SEM analyses led to classify the sepiolit[...]
