Mateus, Ana Carolina Campos creator Varajão, Angélica Fortes Drummond Chicarino creator Oliveira, Fábio Soares de creator Petit, Sabine creator Schaefer, Carlos Ernesto Gonçalves Reynaud creator text periodical abstract or summary bl. continuing eng ABSTRACT: The pedological studies carried out so far in Trindade Island (TI) have obtained patchy evidences of allophane, without detailed mineralogical and micromorphological studies to confirm the occurrence of Andosols in TI. Therefore, in this study, the mineralogical, micromorphological, physical and chemical characterization of four soil profiles from Vulcão do Paredão (P1) and Morro Vermelho formations (P2, P3, and P4) were carried on the latest volcanic events in Brazil from Trindade Island (TI) with the aim of to evaluate the presence of Andosols in this oceanic island. Profiles P1 and P2 are developed on pyroclastic bombs, and show, respectively, A-Bi- C and decapitated A-C horizons, whereas P3 and P4 are developed on lapillitic and bomb pyroclasts, show A-C horizons. The soil profiles have a reddish and brownish clayey matrix, are highly friable and show a plastic consistency. Their microstructures are granular, single grain and intergrain microaggregate, in which aggregates display an undifferentiated b-fabric. The mineralogical constituents of the bulk fraction are biotite, hematite, magnetite, ilmenite, pyroxene, olivine, halloysite, goethite, anatase, and rutile. The clay fraction is marked by the presence of halloysite, ferrihydrite, and little amounts of allophane. All soils presented andic properties and can be classified as non-allophanic Andosols. In addition, micromorphological features closely resemble those reported in Andosols from other volcanic islands from elsewhere. The predominance of halloysite in the clay fraction formed by alteration of sideromelane, suggests that allophane would be an intermediate phase of this rapid transformation favored by the wet climate conditions of the highest parts of TI. Keywords: volcanic island, Andic properties, Andisols, halloysite. Publicação on-line; 7 illus; 6 tables; Sumaries (En); Bibliography p. 1 - 18 CLASSIFICAÇÃO DO SOLO ANÁLISE DO SOLO PROPRIEDADE FÍSICO-QUÍMICA Viçosa-MG Sociedade Brasileira de Ciência do Solo 1977 2024-5955 0100-0683 BR2024004903 v. 44 p. 1-22; (2020) https://www.scielo.br/j/rbcs/a/3mXnZGzJPFFm5Fs4jrz7yKb/?format=pdf&lang=en https://www.scielo.br/j/rbcs/a/3mXnZGzJPFFm5Fs4jrz7yKb/?format=pdf&lang=en BR-BrBNA 250318 20250318130234.0 eng