Topic
Silicate minerals
About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.
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01 Jan 2010
TL;DR: In this article, the authors deal with micromorphological features of silicate neoformation in soil environments and use them to identify silicate mineral authigenesis in earth surface conditions.
Abstract: Publisher Summary This chapter deals with micromorphological features of silicate neoformation in soil environments. Micromorphological techniques have been widely applied to the study of silicate neoformation, both in the field of soil science and for the study of diagenetic processes in sedimentary geology. Their use has greatly contributed to the recognition of silicate mineral authigenesis in earth surface conditions. Micromorphology also provides information about the transformation of authigenic silicates and their inherited counterparts. Electron microscopy has been most commonly used, as a technique that is ideally suited for the study of submicroscopic particles. For palygorskite and sepiolite, this has led to an over-representation in the literature of SEM and TEM images that merely illustrate a fibrous particle morphology rather than textural features with genetic implications. Electron microscopy studies of zeolites and sodium silicates show a highly characteristic and invariable crystal morphology, which makes SEM and TEM important tools for their identification.
12 citations
TL;DR: Results of the sequential-extraction and dissolution experiments revealed that light Ba isotopes favored fluids during the dissolution of silicate minerals, while heavyBa isotopes were prone to being released from interlayers of micaceous layers.
12 citations
TL;DR: In this article, the effect of hydroxamate siderophore desferrioxamine B (DFOB) on cadmium (Cd) and zinc (Zn) adsorption onto two micaceous clay minerals, muscovite and phlogopite, was evaluated in batch experiments.
12 citations
TL;DR: In this article, a microwave-excited argon plasma was used to analyze the mercury content of various types of igneous and granitic rocks, ranging from less than 1 ppb Hg in an igneous biotite to 55 ppb HOg in a pegmatitic biotaite.
12 citations
TL;DR: In this article, black limonite containing ilvaite (a silicate mineral) found in the Yeshan iron deposit, Tongling, China, was studied using mineralogical and chemical analysis.
Abstract: Limonite is mainly derived from weathering of Fe sulfide, iron-bearing carbonate, or silicate minerals. The weathering of Fe sulfide or carbonate minerals to yield limonite from the Tongling mineralization cluster has been studied extensively. Knowledge of the mineralogical and geochemical characteristics of the limonite from weathering of Fe-bearing silicate minerals is still incomplete, however. To address this, black limonite containing ilvaite (a silicate mineral) found in Yeshan iron deposit, Tongling, China, was studied using mineralogical and chemical analysis. The mineralogical characteristics indicated that Mn goethite was present as nano-granular (<15 nm) or acicular (50–100 nm long, ~10 nm wide, i.e. high length/width ratio) crystals with low crystallinity. Groutite, ramsdellite, and pyrolusite were identified in the limonite as ~5 nm nanoparticles, and coated on the goethite surface. Amorphous Fe-Mn phases and silica were highly developed in the limonite studied. Ilvaite crystals showed idiomorphic granular morphology and were replaced by Fe-Mn oxides/hydroxides; pyrite was also present as inclusions within the ilvaite and the ilvaite structural formula calculated was Ca1.04(Fe1.57Mn0.31Mg0.04)(Fe1.09Al0.01)[Si1.95O]O(OH). According to the relatively high CuO and ZnO values and the low Al2O3 value in the black limonite, the negative correlations between (Fe2O3+MnO) and (CuO+ZnO+BaO), (Fe2O3+MnO) and Al2O3, high Mn and Si contents, and the characteristics of the textural relationships and compositions between the black limonite and ilvaite, a semi-enclosed environment with acidic to weakly alkaline conditions was deduced; ilvaite was found to be responsible for the formation and enrichment of limonite.
12 citations