clay minerals alunite

Clay mineralogy and chemistry of halloysite and …

Abstract. A field-mapping and crystal-chemical study of two alunite- and halloysite-rich deposits in the Turplu area, situated northwest of Balıkesir on the Biga …

(PDF) Alunite characterization in the upper Eocene clay …

Alunite mineral was recently identified at the upper Eocene clay deposits associated with laminated primary gypsum and iron oxide in Central Tunisia, particularly at El Gnater site.

Thermal treatment of kaolin: the effect of mineralogy on the …

The determination of alunite is based on the SO 3 content of the samples, since there is no other detectable mineral which may contain S. The K 2 O content, after extracting the K 2 O in alunite, is used for the determination of illite since there is no other K-containing mineral detected in the samples. The average content of K 2 O in illite and …

Alunite supergroup minerals from advanced argillic …

The study of alunite supergroup minerals (alunite, jarosite, and aluminum-phosphate-sulfate (APS) minerals) that are part of the acidic alteration assemblages, can help to better constrain the hydrothermal and supergene alteration events, as these minerals record information about the precipitation environment and the nature and …

Isotope geochemistry and origin of illite-smectite and …

Mineralogical and Geochemical Characteristics and Genesis of the Gülzelyurt Alunite-Bearing Kaolinite Deposit Within the Late Miocene Gödeles Ignimbrite, Central Anatolia, Turkey. Clays and Clay Minerals, Vol. 62, Issue. 6, p. 477. CrossRef; Google Scholar; Yuan, Ye Shi, Guanghai Yang, Mengchu Wu, Yinuo Zhang, Zhaochong Huang, …

Mineralogical and Geochemical Characteristics and Genesis …

Ece, and Schroeder, P.A., 2007 Clay mineralogy and chemistry of halloysite and alunite deposits in the Turplu area, Balikesir, Turkey Clays and Clay Minerals 55 18 – 35. CrossRef Google Scholar Ece, Ö İ İ Schroeder, P.A. Smilley, M. and Wampler, M., 2008 Acid-sulfate alteration volcanic rocks and genesis of halloysite and alunite ...

SPECTRAL PROPERTIES OF ALUNITE-KAOLINITE …

kaolinite, from the Clay Minerals Society, Source Clays Repository, is a low-defect clay from Washington County, Georgia, USA, and was also ground and sieved to a size fraction of 45-125 µm. An Na-bearing alunite spectrum, formed at low temperatures and collected in Sadler, Texas, USA, is also used for comparison to CRISM spectra.

Global occurrence, geology and characteristics of tubular …

Halloysite with tubular morphology is formed in a wide range of geological environments from the alteration of various rock types. Intrusive acidic coarse-grained rocks, such as granites, pegmatites and anorthosite, with large potash and sodic feldspars contents, are subsequently altered to kaolinite, halloysite and other clay minerals by weathering or …

Acid-sulphate hydrothermal alteration of andesitic tuffs and …

Ece, Ö.I. & Schroeder, P.A. (2007) Clay mineralogy and chemistry of the halloysite and alunite deposits in the Turplu area, Balıkesir, Turkey. Clays and Clay Minerals, 55, 18 – 36 . CrossRef Google Scholar

The Gümüşköy (Kütahya, Turkey) kaolin deposit and its …

The Gümüşköy kaolin clay deposit, located ~40 km northwest of Kütahya, Turkey, has promising reserves for ceramic production. In order to evaluate the potential use of this region, five representative clay samples were collected and characterized with X-ray diffraction, polarized light optical microscopy, X-ray fluorescence spectrometry, …

Review of clays and clay minerals in Jordan

The most potential minerals are kaolinite, bentonite, and palygorskite. Other clay minerals as volkonskoite, illite, and black mud are also widely distributed. The following work aims at reviewing the mineralogy, chemistry, origin, and industrial potential of the great diversity of clay minerals in Jordan. Fig. 2.

Mineralogical and geochemical constraints on the …

The main hydrothermal alteration is advanced argillic, characterized by massive vuggy quartz, clay minerals mainly kaolinite, and sporadic alunite supergroup minerals. Mineralization is closely associated with silicic and phyllic alteration types, along with …

The geology of aluminium phosphates and sulphates of the alunite …

Sulphuric waters, when exposed to clay-rich sediments converted clay minerals to alunite and natroalunite. Smectitic clay was converted into hydrated halloysite by interaction with H 2 SO 4 (reaction (1)). Karstification and the formation of APS mineralization was a single-phase process that obviously took place at higher …

Study of the dehydroxylation of kaolinite and alunite from a …

Study of the dehydroxylation of kaolinite and alunite from a Mexican clay with DRIFTS-MS - Volume 51 Issue 1

Rare aluminium phosphates and sulphates (APS) and clay mineral

Uncommon micrometer-sized aluminium phosphates and sulphates of the alunite supergroup (APS minerals) associated with clay minerals were found in a polymictic Permian granite hosted hydrothermal breccia in the Velence Mts. (Hungary). The mineral assemblage was studied with TEM, XRD, EMPA and FTIR with the aim of …

Minerals | Free Full-Text | Mineralogy and a New Fertility …

Alunite is used as a representative mineral for indicating deposits in lithocaps, and lithocaps are generally related to the porphyry–(high-sulfidation) epithermal mineralization system. The study of alunite is of theoretical and exploration significance for prospecting potential underlying porphyry and epithermal deposits. Studies on alunite …

Differentiating Styles of Alteration within Kaolin-Alunite

The Biga Peninsula of NW Turkey is host to many kaolin and halloysite deposits with mineralization occurring at the intersections of fault zones in contact with Late Eocene.Miocene calc-alkaline volcanic rocks. Distinguishing between the relative over of hypogene by supergene processes in these deposits is a challenge and …

Study of the dehydroxylation of kaolinite and alunite …

Therefore, it is possible to study the dehydroxylation process of clays during thermal treatment.Chemical and mineralogical characterization of a kaolinitic clay (KN) …

Detection of Interlayered Illite/Smectite Clay Minerals with …

Accurate determination of clay minerals can be challenging due to the natural occurrence of interlayered phases, i.e., layers of different clay species such as illite and smectite. The overlap of peaks of the constituent minerals (e.g., illite and smectite), and the similarity of diffraction patterns when not treated with ethylene glycol, hampers …

Alunite, Natroalunite and Hydrated Halloysite in Carlsbad …

Formation of these minerals is related to the excavation of the carbonate rocks that formed Carlsbad Cavern, Lechuguilla Cave and other caves of the Guadalupe Mountains. The sulfuric acid-bearing waters, when exposed to clay-rich sediments, converted clay minerals and quartz to alunite/natroalunite and hydrated halloysite.

Comparison of Epithermal Kaolin Deposits from the Etili Area …

Fluids in the pH 2–3 range can dissolve minerals such as volcanic glass, feldspar, and mica but not secondary kaolinite and alunite group minerals because Al is insoluble over these pH ranges ( et al., 1974; Sillitoe, 1993). All the above-mentioned research indicates that the kaolin deposits with associations rich in kaolin + …

Minerals | Free Full-Text | Hydrothermal Alteration …

Common products of the interaction between the kind of fluids mentioned previously and andesitic rocks include sulfate minerals, clay minerals (e.g., smectites and chlorite), quartz, pyrite, and iron …

The geology of aluminium phosphates and sulphates of the alunite …

APS minerals are members of the alunite–jarosite family. The general formula of the APS minerals, the name has been coined based on the major elements in the supergroup, is AB 3 (XO 4) 2 (OH) 6, where A is a large cation (Na, U, K, Ag, NH 4, Pb, Ca, Ba, Sr, REE) in 12-fold coordination. B sites are occupied by cations of the elements …

Progressive formation of halloysite from the hydrothermal

Occurrences of halloysite-rich material in altered volcanic rocks, principally trachyandesites, dacites, and tuffs, extend over an area of ∼1 km2 in the southwestern part of Limnos, Island, northeast Aegean Sea, Greece. The present study was designed to investigate the alteration processes which acted on the biotite in these volcanic rocks, to …

Zeolite-clay mineral zonation of volcaniclastic sediments …

The mixed-layer and 7-A clay minerals are associated with the potassium feldspar-alunite zone of alteration, and the dioctahedral smectite is associated with clinoptilolite. This mineralogical zonation may be an exploration guide for mercury and uranium mineralization in the caldera complex environment.

Rare aluminium phosphates and sulphates (APS) and …

Flotation of alunite and clay minerals

FLOTATION OF ALUNITE AND CLAY MINERALS V. S. Uvarov andN. E. Vovk UDC 622.765 : 622.349.42 A difficulty encountered in the development of flotation schemes for extracting sulfate minerals is their sepa- ration from minerals with high solubility and high absorptivity. Such minerals include alunite, ferri-haUoysiteo and

Detection of Interlayered Illite/Smectite Clay Minerals with …

The occurrence of zeolite and an outcrop of bentonite rocks was described by Arribas et al. [] and García-Romero et al. [].A description of the mineral assemblage of the Rodalquilar area was presented by Arribas et al. [].The surface rocks are characterized by quartz, k feldspar, illite, smectite, alunite, pyrophyllite and several Fe oxides such as …

CLAY MINERALOGY AND CHEMISTRY OF HALLOYSITE …

CLAY MINERALOGY AND CHEMISTRY OF HALLOYSITE AND ALUNITE DEPOSITS IN THE TURPLU AREA, BALIKESIR, TURKEY O¨ .IS I˙K ECE 1,2,* AND PAUL A. SCHROEDER 1 1 The University of Georgia, Department of Geology, Athens, GA 30602-2501, USA 2 Istanbul Technical University, Faculty of Mines, Department of Geological …

Alunite | Mineral, Description, Uses, & Facts | Britannica

alunite, a widespread rock-forming sulfate mineral that occupies pockets or seams in volcanic rocks such as rhyolites, trachytes, and andesites, …