Results 51 to 60 of about 7,701 (219)

Magmatismos alcalinos criogeniano (CSF) e ediacarano (SOS): mineralogia e petrologia [PDF]

, 2023
A realização deste estudo teve como objetivos a descrição petrográfica, a identificação e caracterização textural e da química mineral da mineralogia exótica acessória presente nas rochas do Batólito Nefelina Sienítico Itarantim, localizado na porção ...
Lopes, Nivia Ferreira
core  

Syn-volcanic melt-rock reactions recorded in peridotitic xenoliths from Scania, S Sweden

Mineralogia
Peridotite xenoliths from Scania (S Sweden), brought to the surface by Mesozoic basanitic magmas, provide insights into the lithospheric mantle underlying the East European Craton.
Kukuła Anna, Matusiak-Małek Magdalena, Mikrut Jakub, Ntaflos Theodoros, Johansson Leif   +4 more
doaj   +1 more source

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

Mimetite precipitation on Pb-clinoptilolite: an effective approach for arsenate removal from water

Mineralogia
This short communication proposes a novel approach to arsenate remediation using in situ precipitation of mimetite [Pb5(AsO4)3Cl], a sparingly soluble mineral phase with an apatite structure.
Stępień Ewa, Manecki Maciej, Bajda Tomasz   +2 more
doaj   +1 more source

Mineralogical and whole-rock geochemical characterization of cherts from Gebel EL-Khashab (Oligocene), East Cairo, Egypt: evidence for silica sources

Mineralogia
Chert, a primarily silica-bearing sedimentary rock, is often found in limited layers within the Earth's lithosphere. Optical microscopy, X-ray diffraction, major and trace element analyses were used to study chert samples from Gebel El-Khashab—an ...
Hassan Kamaleldin M.
doaj   +1 more source

Alteração mineralógica de Neossolos em uma climo-litossequência no Planalto do Rio Grande do Sul Mineral weathering in Neossolos in a climo-litosequence on the Rio Grande do Sul Plateau, Brazil

Ciência Rural, 2012
No Estado do Rio Grande do Sul (RS), os Neossolos Litólicos e Neossolos Regolíticos são solos que têm sofrido forte pressão de uso, demandando maior conhecimento sobre sua gênese e mineralogia.
Fabrício de Araújo Pedron, Antonio Carlos de Azevedo, Ricardo Simão Diniz Dalmolin   +2 more
doaj   +1 more source

Optimized bifunctional CuNiMgAl catalysts for efficient synthesis of the renewable bioproduct glycerol carbonate

Biofuels, Bioproducts and Biorefining, Volume 19, Issue 5, Page 1271-1288, September/October 2025.
Abstract This paper presents a novel technology for converting glycerol, a byproduct of the biodiesel industry, into glycerol carbonate, a high‐value bioproduct. The effect of calcination temperature on the synthesis of quaternary Cu‐Ni‐Mg‐Al catalysts (MMO‐Cu15Ni15‐Tz) and their application in the transesterification reaction was investigated ...
Dalma S. Argüello, Isabel Barroso‐Martín, Nancy F. Bálsamo, Griselda A. Eimer, Mónica E. Crivello, Enrique Rodríguez‐Castellón   +5 more
wiley   +1 more source

2. Congreso geologico de EspaNa [PDF]

, 1988
Available from Centro de Informacion y Documentacion Cientifica CINDOC. Joaquin Costa, 22. 28002 Madrid.
Sociedad EspaNola de Mineralogia, Madrid (Spain)
core  

Turmalinitos do Grupo Brusque na região entre São João Batista e Tijucas, Santa Catarina, Brasil

Geologia USP. Série Científica, 2013
O Cinturão Dom Feliciano no Estado de Santa Catarina é representado pelos grupos Itajaí e Brusque e o Batólito Florianópolis. A Formação Rio do Oliveira, basal do Grupo Brusque, constitui-se de unidades metabásicas/cálcio-silicáticas, metavulcânicas ...
Gianna Maria Garda, Fabio Brentan, Miguel Angelo Stipp Basei   +2 more
doaj  

Changes in chemical composition of peridotite olivine crystals as a result of xenolith–host rock interaction (Jeziorna, Lower Silesia, SW Poland)

Mineralogia
Petrological observations and major elements analyses in olivine crystals in small xenoliths (>1.5 cm in diameter) from the Jeziorna locality, SW Poland, are presented.
Nowak Monika
doaj   +1 more source