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Dr. Teresa Pi
LANGEM (Laboratorio Nacional de Geoquímica y Mineralogía); UNAM

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0 Diffraction
0 Geochemistry
0 Mineralogy
0 Mineral Chemistry
0 Clay mineralogy

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Journal article
Published: 07 July 2021 in Minerals
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Valencianite has been described as a variety of K-feldspar (adularia) from La Valenciana mine, Guanajuato, Mexico, from which three samples were used for this study. We present new major and trace element analysis, X-ray powder diffraction with Rietveld refinement, and single-crystal 40Ar/39Ar ages of this classical mineral. A detailed review of major works on feldspars and relevant papers from adularia shows that the structure of this mineral has monoclinic and triclinic domains with variable degrees of Al/Si order that we have been only able to model by powder X-ray diffraction assuming the presence of monoclinic (~50%) plus triclinic (~50%) K-feldspar. The literature data show some extreme structural states for adularia obtained in the pre-Rietveld refinement era; these data are dubious and need to be reanalyzed. A triangular diagram using the relative development of {110}, {010} and {001} faces is proposed. The temperature of formation, the Na/K ratio, and the growth kinetics seem to be the main factors controlling the morphological changes in K-feldspar crystals. The geochemistry of valencianite shows an almost pure orthoclase composition, as is common in most adularia crystals, although compositions up to Or90Ab10 have been found. Measurement of thallium in adularia can be an exploration guide for ore deposits. The weighted mean of 15 40Ar/39Ar analyses of one valencianite from La Valenciana mine gave an age of 30.43 ± 0.27 Ma (2 standard deviations). It is discussed whether valencianite can be considered a new mineral.

ACS Style

Jesús Solé; Teresa Pi-Puig; Amabel Ortega-Rivera. A Mineralogical, Geochemical, and Geochronological Study of ‘Valencianite’ from La Valenciana Mine, Guanajuato, Mexico. Minerals 2021, 11, 741 .

AMA Style

Jesús Solé, Teresa Pi-Puig, Amabel Ortega-Rivera. A Mineralogical, Geochemical, and Geochronological Study of ‘Valencianite’ from La Valenciana Mine, Guanajuato, Mexico. Minerals. 2021; 11 (7):741.

Chicago/Turabian Style

Jesús Solé; Teresa Pi-Puig; Amabel Ortega-Rivera. 2021. "A Mineralogical, Geochemical, and Geochronological Study of ‘Valencianite’ from La Valenciana Mine, Guanajuato, Mexico." Minerals 11, no. 7: 741.

Journal article
Published: 14 January 2021 in Coatings
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Maya blue is a well-known pre-Hispanic pigment, composed of palygorskite or sepiolite and indigo blue, which was used by various Mesoamerican cultures for centuries. There has been limited research about its continued use during the Viceroyalty period; therefore, the sixteenth century is the perfect period through which to study the continuity of pre-Hispanic traditions. The fact that the indigenous people were active participants in the construction and decoration of convents makes their wall paintings a good sampling material. X-ray fluorescence (XRF), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed in samples of blue found in convents across Puebla, Tlaxcala and Morelos in order to identify whether the numerous hues of blue were achieved with Maya blue or with other pigments. We found no copper (Cu) or cobalt (Co) with the XRF, so several pigments, such as azurite, smalt or verdigris, were discarded. With SEM, we discovered that the micromorphology of certain blues was clearly needle-shaped, suggesting the presence of palygorskite or sepiolite. In addition, we found silicon (Si), magnesium (Mg) and aluminum (Al) by using energy-dispersive X-ray spectroscopy (EDS) in all blue samples, which also suggests the presence of these magnesium-rich clay minerals. With the XRD samples, we verified that the blues were produced with these two clay minerals, thus confirming that several wall paintings were manufactured with Maya blue. These findings confirm that this particular manmade pre-Hispanic pigment, Maya blue, was an important pigment prior to the Viceroyal period.

ACS Style

Luisa Straulino-Mainou; Teresa Pi-Puig; Becket Lailson-Tinoco; Karla Castro-Chong; María Fernanda Urbina-Lemus; Pablo Escalante-Gonzalbo; Sergey Sedov; Aban Flores-Morán. Maya Blue Used in Wall Paintings in Mexican Colonial Convents of the XVI Century. Coatings 2021, 11, 88 .

AMA Style

Luisa Straulino-Mainou, Teresa Pi-Puig, Becket Lailson-Tinoco, Karla Castro-Chong, María Fernanda Urbina-Lemus, Pablo Escalante-Gonzalbo, Sergey Sedov, Aban Flores-Morán. Maya Blue Used in Wall Paintings in Mexican Colonial Convents of the XVI Century. Coatings. 2021; 11 (1):88.

Chicago/Turabian Style

Luisa Straulino-Mainou; Teresa Pi-Puig; Becket Lailson-Tinoco; Karla Castro-Chong; María Fernanda Urbina-Lemus; Pablo Escalante-Gonzalbo; Sergey Sedov; Aban Flores-Morán. 2021. "Maya Blue Used in Wall Paintings in Mexican Colonial Convents of the XVI Century." Coatings 11, no. 1: 88.

Journal article
Published: 01 October 2020 in Minerals
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The mineralogy of surface crusts and efflorescent salts of two old abandoned tailings (Xochula and Remedios) of the mining district of Taxco, Guerrero, was studied by short-wave infrared spectroscopy (SWIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The chemistry of the selected samples was studied with induced coupled plasma mass spectrometry (ICP–MS). Principal mineralogy is composed of hydrated sulfates of iron (di-trivalent), other less-soluble sulfates such as gypsum and jarosite, and oxides–hydroxides of iron, all of which are the result of the weathering of sulfides (mainly pyrite) accumulated in mining waste. Using quantitative X-ray diffraction (Rietveld method) and the spatial distribution of secondary minerals, two main zones (lateral and central) have been established in both tailings. The genetic model for their formation shows that the secondary iron minerals (sulfates, oxides, and hydroxides) in these deposits have been formed at least in three different stages, mainly by oxidation, dissolution, and precipitation processes in combination with dehydration and primary sulfides neutralization reactions. The chemical analyses of some salts confirm the presence of potentially toxic elements (PTE) in their structure and therefore indicate that the dissolution of the efflorescences in these deposits is a potential source of contamination during the wet season.

ACS Style

Teresa Pi-Puig; Jesús Solé; Adriana Gómez Cruz. Mineralogical Study and Genetic Model of Efflorescent Salts and Crusts from Two Abandoned Tailings in the Taxco Mining District, Guerrero (Mexico). Minerals 2020, 10, 871 .

AMA Style

Teresa Pi-Puig, Jesús Solé, Adriana Gómez Cruz. Mineralogical Study and Genetic Model of Efflorescent Salts and Crusts from Two Abandoned Tailings in the Taxco Mining District, Guerrero (Mexico). Minerals. 2020; 10 (10):871.

Chicago/Turabian Style

Teresa Pi-Puig; Jesús Solé; Adriana Gómez Cruz. 2020. "Mineralogical Study and Genetic Model of Efflorescent Salts and Crusts from Two Abandoned Tailings in the Taxco Mining District, Guerrero (Mexico)." Minerals 10, no. 10: 871.

Journal article
Published: 26 April 2020 in Minerals
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The detailed mineralogical, physical and chemical characterization of nine samples of imported cosmetic talc and of two samples of talc from currently non-productive Mexican ore deposits (Oaxaca and Puebla States) is presented. The imported cosmetic talc was classified into two groups, considering whether they are packed in the country of origin or in Mexico and considering their price. X-ray diffraction, infrared short wave, thermogravimetric analysis and scanning electron microscopy were used for mineralogical characterization. For the physical characterization, colorimetry and laser granulometry were used. The chemical composition (major, trace elements) was studied by ICP-MS. It was concluded that only the highest priced and imported in packaged form talcs meet the specific purity requirements for a talc of cosmetic type. The talcs that are packed in Mexico and the talc of the studied Mexican deposits present mineralogical and chemical impurities that make their use difficult in the manufacture of high-quality cosmetic talc. The low-price talc should not be sold as cosmetic talc, and the regulations in Mexico on this subject should be reviewed and updated.

ACS Style

Teresa Pi-Puig; Dante Yosafat Animas-Torices; Jesús Solé. Mineralogical and Geochemical Characterization of Talc from Two Mexican Ore Deposits (Oaxaca and Puebla) and Nine Talcs Marketed in Mexico: Evaluation of Its Cosmetic Uses. Minerals 2020, 10, 388 .

AMA Style

Teresa Pi-Puig, Dante Yosafat Animas-Torices, Jesús Solé. Mineralogical and Geochemical Characterization of Talc from Two Mexican Ore Deposits (Oaxaca and Puebla) and Nine Talcs Marketed in Mexico: Evaluation of Its Cosmetic Uses. Minerals. 2020; 10 (5):388.

Chicago/Turabian Style

Teresa Pi-Puig; Dante Yosafat Animas-Torices; Jesús Solé. 2020. "Mineralogical and Geochemical Characterization of Talc from Two Mexican Ore Deposits (Oaxaca and Puebla) and Nine Talcs Marketed in Mexico: Evaluation of Its Cosmetic Uses." Minerals 10, no. 5: 388.

Journal article
Published: 31 March 2020 in Journal of Arid Environments
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The introduction of exotic buffelgrass (Pennisetum ciliare) to the Sonoran Desert has modified the structure and fuel loads of desert scrub, creating a continuous fuel bed and altering fire frequencies and intensities. The damage to native vegetation has been widely acknowledged, but the mechanisms underlying the response have been little studied. Considering bark as one of the important characteristics to protect stems from fire, this study aimed to compare bark traits of two native Sonoran desert trees (Bursera microphylla and Olneya tesota) that may promote cambium survival from fire. Physical features of trees and fuel that influence fire behavior were analyzed, and bark characteristics were examined, including anatomy and chemical composition, to determine how these properties may influence their survival to fire. Surprisingly, drought-resistant traits of Bursera microphylla, such as thicker inner bark and greater stem water reserves make this species better able to survive fires, providing up to ten times more resistance to heat inputs from buffelgrass. In contrast, Olneya tesota has a dry and narrow inner bark, a flammable outer bark, fuel material accumulation under its crown, and large branches close to the soil surface, characteristics that increase fire intensity and give less protection to stem live tissues.

ACS Style

Estefania Roldan-Nicolau; Teresa Terrazas; Margarita Navarrete Montesinos; Teresa Pi; Clara Tinoco-Ojanguren. Effect of buffelgrass fires on two Sonoran Desert trees: Bark and structural analyses. Journal of Arid Environments 2020, 178, 104166 .

AMA Style

Estefania Roldan-Nicolau, Teresa Terrazas, Margarita Navarrete Montesinos, Teresa Pi, Clara Tinoco-Ojanguren. Effect of buffelgrass fires on two Sonoran Desert trees: Bark and structural analyses. Journal of Arid Environments. 2020; 178 ():104166.

Chicago/Turabian Style

Estefania Roldan-Nicolau; Teresa Terrazas; Margarita Navarrete Montesinos; Teresa Pi; Clara Tinoco-Ojanguren. 2020. "Effect of buffelgrass fires on two Sonoran Desert trees: Bark and structural analyses." Journal of Arid Environments 178, no. : 104166.

Journal article
Published: 04 November 2016 in Geosciences
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Researchers have related the manufacturing technique of plasters and stucco in the Maya area with their period of production but not with their architectural function. In this paper, we establish a relationship between those three features (manufacturing technique, age, and architectural function) in the plasters of the Maya site of Dzibanché in southern Quintana Roo. Dzibanché has abundant remains of stuccos and plasters found mainly in three buildings (Plaza Pom, Pequeña Acrópolis, and Structure 2). We used thin sections, SEM and XRD, and archaeomagnetic dating processes. The pictorial layer of Structure 2 was the earliest (AD 274–316 and the stuccoes and plasters of the other two buildings were dated to the Middle Classic (AD 422–531), but we obtained different archaeomagnetic dates for the red pigment layers found in the buildings of the Pequeña Acrópolis and thus we were able to determine their chronological order of construction. The raw materials and proportions were carefully chosen to fulfil the mechanical necessities of the architectonic function: different proportions were found in plasters of floors, in the external walls, and inside the buildings; differences between earlier and later plasters were also detected.

ACS Style

Luisa Straulino Mainou; Sergey Sedov; Ana María Soler Arechalde; Teresa Pi Puig; Gerardo Villa; Sandra Balanzario Granados; María-Teresa Doménech-Carbó; Laura Osete-Cortina; Daniel Leonard. Maya Lime Mortars—Relationship between Archaeomagnetic Dating, Manufacturing Technique, and Architectural Function—The Dzibanché Case. Geosciences 2016, 6, 49 .

AMA Style

Luisa Straulino Mainou, Sergey Sedov, Ana María Soler Arechalde, Teresa Pi Puig, Gerardo Villa, Sandra Balanzario Granados, María-Teresa Doménech-Carbó, Laura Osete-Cortina, Daniel Leonard. Maya Lime Mortars—Relationship between Archaeomagnetic Dating, Manufacturing Technique, and Architectural Function—The Dzibanché Case. Geosciences. 2016; 6 (4):49.

Chicago/Turabian Style

Luisa Straulino Mainou; Sergey Sedov; Ana María Soler Arechalde; Teresa Pi Puig; Gerardo Villa; Sandra Balanzario Granados; María-Teresa Doménech-Carbó; Laura Osete-Cortina; Daniel Leonard. 2016. "Maya Lime Mortars—Relationship between Archaeomagnetic Dating, Manufacturing Technique, and Architectural Function—The Dzibanché Case." Geosciences 6, no. 4: 49.