Results 51 to 60 of about 26,121 (210)

Thermal Decomposition of Synthetic Argentojarosite - Implications for Silver Production in Medieval Times [PDF]

, 2005
The thermal decomposition of argentojarosite has been studied by thermogravimetric, spectroscopic and infrared emission techniques. Dehydroxylation occurs in three stages at 228, 383, 463 degrees Celsius with the loss of 2, 3 and 1 hydroxyl units.
Frost, Raymond, Martens, Wayde, Weier, Matthew, Wills, Rachael-Anne   +3 more
core   +2 more sources

Gipsgärten: Selbstorganisierte röhrenförmige Strukturen aus Calciumsulfat mit Relevanz für die Suche nach außerirdischem Leben

Angewandte Chemie, Volume 137, Issue 48, November 24, 2025.
Chemische Gärten sind selbstorganisierte abiotische Strukturen mit „lebensähnlichen” Formen. Hier zeigen wir, dass solche Prozesse auch nach Zugabe konzentrierter Sulfatlösungen zu festen Calciumsalzen ablaufen und sogenannte Gipsgärten ergeben. Die dafür nötigen Bedingungen sind weitgehend kompatibel mit den geochemischen Verhältnissen auf dem frühen ...
Selina Reigl, Elisabeth Wagner, Carlos Pimentel, Werner Kunz, Alexander E. S. Van Driessche, Matthias Kellermeier   +5 more
wiley   +1 more source

Chemical and isotopic characterization of nitrate retained and leached from soil after manure fertilization-by lysimeter experiments [PDF]

E3S Web of Conferences, 2019
Increase of soil fertilization produces an increase of N exported to the hydrosphere. The amount of nitrate that reaches the aquifers is controlled by processes affecting N-species within the soils.
Otero Neus, Llovet Alba, Carrey Raúl, Ribas Angela, Domene Xavier, Mattana Stefania, Chin-Pampillo Juan, Alcañiz Josep Mᵃ, Soler Albert   +8 more
doaj   +1 more source

Crystallography and mineralogy of the clay fraction of hardsetting horizons in soils of coastal tablelands in Brazil [PDF]

, 2009
A coesão de horizontes de solos do Brasil vem sendo associada, principalmente, a fatores físicos e químicos inter-relacionados, mas a influência das propriedades mineralógicas e cristalográficas dos minerais da fração argila também foi aventada por ...
BRINATTI, André Maurício, GIAROLA, Neyde Fabíola Balarezo, LIMA, Herdjania Veras de, ROMERO, Ricardo Espíndola, SILVA, Alvaro Pires da   +4 more
core   +3 more sources

Gypsum Gardens: Self‐Assembled Tubular Structures of Calcium Sulfate with Relevance for the Detection of Extraterrestrial Life

Angewandte Chemie International Edition, Volume 64, Issue 48, November 24, 2025.
Chemical gardens are self‐assembled architectures with “life‐like” morphologies that form in the absence of any biological activity. Here we show that such structures can also be obtained by contacting reservoirs of calcium and sulfate ions, under conditions that plausibly emulate those prevailing on early Mars.
Selina Reigl, Elisabeth Wagner, Carlos Pimentel, Werner Kunz, Alexander E. S. Van Driessche, Matthias Kellermeier   +5 more
wiley   +1 more source

Some notes on the IUGS classification of lamprophyric rocks

Mineralogia
The lamprophyric rocks are uncommon volatile-rich melanocratic porphyritic rocks which contain only mafic phenocrysts. The felsic minerals are confined in the groundmass. They occur as dikes, sills and diatremes.
Kamvisis Ioannis, Phani Pothuri Ramesh Chandra   +1 more
doaj   +1 more source

Mineralogical characterization of Sn deposits from the Santa Fe District, Bolivia [PDF]

, 2015
The Sn-Zn-Pb-Ag Japo-Santa Fe-Morococala ore deposit is located in the Central Andean Belt province. The ore mineralization is hosted in a Paleozoic metasedimentary sequence and porphyritic Oligocene-Miocene igneous rocks. Ore minerals occur in veins and
Alfonso Abella, María Pura, Canet Miquel, Carles, García-Vallès, Maite, Jiménez-Franco, Abigail, Trujillo, Juan Elvys   +4 more
core  

Modulation of the Acidity of HY, HBETA, and HZSM‐5 Zeolites by Lanthanum Incorporation for Selective Gasoline Desulfurization in the FCC Riser

ChemCatChem, Volume 17, Issue 21, November 10, 2025.
Desulfurization in the FCC riser is achieved by modifying zeolite catalysts with La3+ ions, promoting H2S formation from thiophenic compounds while suppressing secondary reactions. This approach enhances gasoline quality by increasing selectivity for H2S and enabling efficient condensation and alkylation, supporting cleaner fuel production and ...
Ronaldo C. Santos, Daniel F. Almeida, Anderson C. dos S. Silva, Yiu L Lam, José M. M. Ferreira, D. Ballesteros‐Plata, Enrique Rodríguez‐Castellón, Agustin Martínez, Luiz A. M. Pontes   +8 more
wiley   +1 more source

Integrating rotational components to optical properties observed in petrographic thin sections via automated image acquisition and analysis

Mineralogia
The analysis of petrographic thin sections is a widely used process for the identification of the mineralogy of rocks and the analysis of their textural and microstructural characteristics.
Pretorius Jacob Johannes, Mayne Matthew Jason   +1 more
doaj   +1 more source

BOOK REVIEW Introdução a Mineralogia Pratica [PDF]

SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY, 2008
PAULO CESAR PEREIRA DAS NEVES, FLÁVIA SCHENATO, FLÁVIO ANTÔNIO BACHI, "Introdução a Mineralogia Pratica", 2a edição, Revisada e Atualizada, Editora da ULBRA, Canoas, RS, Brasil, 2008, 335 paginas. A 2ª edição deste excelente livro apresenta além de um acréscimo no número de páginas, uma melhoria significativa com respeito à 1ª edição.
openaire   +1 more source