 | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 47, No, 4, 399~409, 1999, A NEW APPROACH TO COMPOSITIONAL LIMITS FOR...FOR SEPIOLITE AND PALYGORSKITE Ma EMILIO GALAN AND ISABEL CARRETERO Departamento Cristalograffa y Mineralogia...Spain Abstract-Most bulk chemical analyses of sepiolite and palygorskite available in the literature are...erroneous because samples analyzed are admixtures of minerals that are difficult to separate or identify by...problem. Chemical analyses are summarized for sepiolite and palygorskite reported in the literature (bulk |  | | Journal (article/letter/editorial) | | Mineralogist Vol. 40, pp. 1091-1102 (2002) ORIGIN OF SEPIOLITE AND LOUGHLINITE IN A NEOGENE VOLCANO-SEDIMENTARY...features. Sepiolite and loughlinite are dominant in the claystone of the study area. These minerals are generally...dolomite and calcite. At Mihalıççık, loughlinite and sepiolite are identified by d(110) reflections at 12.9 and...and 12.3 Å, respectively. Loughlinite and sepiolite occur as fibers in dissolution voids and along the...Si and Mg, which are used for the formation of sepiolite. Increasing evaporation causes the dominance of |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 68, No. 4:347–360, 2020 TRANSFORMATION OF MAGNESITE TO SEPIOLITE AND STEVENSITE:...this deposit, sepiolite and newly found stevensite occur locally as two daughter minerals formed from magnesite...magnesite. The sepiolite and stevensite show distinctive compositions and modes of formation compared...of the current study was to characterize these minerals by means of mineralogic, thermal, structural,...The XRD analyses showed that the d110 of the sepiolite was at 12.64 Å and at 13 Å after air-drying and |  | Kadi˙r, Selahatti˙n, Eren, Muhsin, İrkeç, Taner, Erkoyun, Hülya, Külah, Taci˙t, Önalgi˙l, Nergis, Huggett, Jennifer (2017) An Approach to Genesis of Sepiolite and Palygorskite In Lacustrine Sediments of the Lower Pliocene Sakarya and Porsuk Formations in the Si˙vrii˙hii˙sar and Yunusemre-bii˙çer Regions (Eskişehii˙r), Turkey. Clays and Clay Minerals, 65 (5) 310-328 doi:10.1346/ccmn.2017.064067 | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 65, No. 5, 310–328, 2017. AN APPROACH TO GENESIS OF SEPIOLITE AND PALYGORSKITE...the formation of these economically important sepiolite/palygorskite/carbonate/evaporite deposits based...restricted depositional environment. The formation of sepiolite and palygorskite fibers, either as cement between/enclosing...ratio suggests deposition of carbonate dolomitic sepiolite sepiolitic dolomite under arid climate and oxic...sediments indicate deposition of organic-bearing sepiolite/palygorskite under anoxic-dysoxic conditions. |  | Kadīr, Selahattīn, Erkoyun, Hülya, Eren, Muhsīn, Huggett, Jennifer, Önalgil, Nergīs (2016) Mineralogy, Geochemistry, and Genesis of Sepiolite and Palygorskite in Neogene Lacustrine Sediments Eskīşehīr Province, West Central Anatolia, Turkey. Clays and Clay Minerals, 64 (2) 145-166 doi:10.1346/ccmn.2016.0640206 | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 64, No. 2, 145–166, 2016. MINERALOGY, GEOCHEMISTRY, AND GENESIS OF SEPIOLITE... Cromwell Road, London SW7 5BD, UK Abstract—Sepiolite and palygorskite are common as layers and nodules...distribution of these economically important sepiolite and palygorskite deposits within the lacustrine...environmental conditions for their formation. Sepiolite and palygorskite layers are associated with dolomite...dolomite, marlstone, and argillaceous limestone. The sepiolite nodules (meerschaum), which are former magnesite |  | Giustetto, Roberto, Macaluso, Loredana, Berlier, Gloria, Ganjkhanlou, Yadolah, Barale, Luca (2019) Characterisation and possible hazard of an atypical asbestiform sepiolite associated with aliphatic hydrocarbons from Sassello, Ligurian Apennines, Italy. Mineralogical Magazine, 83 (2) 209-222 doi:10.1180/mgm.2018.159 | Journal (article/letter/editorial) | | and possible hazard of an atypical asbestiform sepiolite associated with aliphatic hydrocarbons from Sassello...giustetto@unito.it Abstract An unusual occurrence of asbestiform sepiolite, filling veins in the antigorite...Optical microscopy and SEM-EDS proved that these sepiolite fibres, apparently up to several cm long, are...geological context suggests that the Sassello sepiolite precipitated from hydrothermal fluids, which were...10.1180/mgm.2018.159. Sassello asbestiform sepiolite associated to hydrocarbons extremely long and |  | | Journal (article/letter/editorial) | | August 2014, Vol. 78(4), pp. 919–940 Asbestiform sepiolite coated by aliphatic hydrocarbons from Perletoa...Hudson-Edwards] ABSTRACT An atypical asbestiform sepiolite occurrence with exceptionally long fibres wrapped by...association not reported in the literature. The sepiolite fibrils and their organic coating probably originated...hydrocarbons has serious implications for the sepiolite habit, as the organic wrap interacts with the...when dispersed in air and inhaled. K EY WORDS : sepiolite, aliphatic hydrocarbons, Fischer-Tropsch-type |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 52, No. 2, 227–239, 2004. ULTRAMAFIC-ROCK-HOSTED VEIN SEPIOLITE OCCURRENCES...2 m thick brecciated zone containing magnesian minerals is present at the contact of tectonites and cumulates...with serpentine (0.5 m), (3) white dolomite with sepiolite (0.4 m), and (4) greenish-white dolomite with...serpentine, the third level comprises dolomite + sepiolite, and the fourth level is made up of dolomite +...which includes serpentine and gabbro relics. Sepiolite developed at the edges and surfaces of dolomite |  | | Journal (article/letter/editorial) | | sections (BER, PEL and UPC) containing limestones, sepiolite, dolostones and opaline cherts were examined;...foot of the alluvial fans or in interfan areas, sepiolite precipitated within free water bodies (BER section)...formation of palustrine sepiolite deposits. Later, the intense silicification of the sepiolite produced lenticular...lakes (UPC section), palustrine limestones and sepiolite were deposited. The carbonates are partially affected...affected by silicification, the sepiolite becoming completely silicified. The opaline levels clearly |  | | Journal (article/letter/editorial) | | minerals Review An Overview of Authigenic Magnesian Clays Manuel Pozo 1, * 1 2 * and José Pedro Calvo...Published: 9 November 2018 Abstract: Clay authigenesis mostly concerns: (a) the formation...development of clays by transformation of precursor minerals. Precipitation from solution implies that a new...inherited. Transformation of precursor detrital minerals, a process also termed “neoformation by addition”...include 2:1 clay minerals, such as talc-kerolite and Mg-smectites, as well as fibrous clays (sepiolite, palygorskite) |  | | Book | | Chemistry of Sepiolite and Palygorskite 1. The Structures and Microtextures of the Palygorskite-Sepiolite Group...Group Minerals 3 Stephen Guggenheim and Mark P.S. Krekeler 1.1 Introduction 3 1.2 Part 1. Structure-Related...Structural Characteristics of the Palygorskite-Sepiolite Mineral Group 1 .2.2 Species and Nomenclature...Structure of the Palygorskite-Sepiolite Mineral Group and Related Minerals 1 .2.4 Substitutions in Palygorskite...Palygorskite and Sepiolite 7 14 1 .2.5 H20, OH2, and OH Positions in Palygorskite and Sepiolite 15 1 .2 |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals. Vol. 34, No, 3, 353-356, 1986, NOTES VEIN-LIKE SEPIOLITE OCCURRENCE AS A REPLACEMENT...Key Words-Magnesite, Sepiolite, Serpentinite, Thermal analysis, <;aylfba~ sepiolite was examined by XRD...infrared (IR) spectrophotometer. A vein-like occurrence of sepiolite has recently been discovered in the <;aYlfba~...from a few millimeters to 30 cm in thickness. Sepiolite was observed only at the opening and the neighboring...bottom ofthese veins. In contrast, nearly pure sepiolite occurs close to the topographic surface, and there |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 45, No. 3, 378-389, 1997. TEXTURAL TRANSITION AND GENETIC RELATIONSHIP...RELATIONSHIP BETWEEN PRECURSOR STEVENSITE AND SEPIOLITE IN LACUSTRINE SEDIMENTS (JBEL RHASSOUL, MOROCCO) AZEDDINE...of the Jbel Rhassoul (Morocco), stevensite and sepiolite, confined to the dolomitic facies, are commonly...reveal a relation between these 2 magnesian clay minerals. One can observe the different transition steps...to the complete replacement of stevensite by sepiolite. That transition can also be observed by scanning |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 58, No. 2, 205–219, 2010. DOLOCRETES AND ASSOCIATED PALYGORSKITE OCCURRENCES...authigenic clay lenses. The mineralogical characteristics of dolocrete and authigenic clay lenses were...variable amounts of palygorskite. The authigenic clay lenses are composed mainly of palygorskite. Dolomite...(1987) and Kadir and Eren (2008) explained the occurrence of palygorskite associated with calcretes in...uncomformably overlie Paleozoic schists and Clays and Clay Minerals marbles, Permian to Triassic ophiolitic rocks |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 51, No. 3, 279–292, 2003. THE GEOLOGY AND ORIGIN OF SEPIOLITE, PALYGORSKITE...alkaline-lake environments where sepiolite, palygorskite, saponite and dolomitic sepiolite or palygorskite precipitated...precipitated periodically in the basin. Sepiolite is predominant in the Kuyucak section and is intercalated...basaltic volcanism occurred. The contacts between sepiolite-palygorskite and saponite levels are more or less...environment. Micromorphological images reveal that both sepiolite and palygorskite grew as interwoven fibers or |  | | Journal (article/letter/editorial) | | 床 学 会 誌1966年9月5日 研 究 報 文 ANICKELIFEROUS SEPIOLITE FROM THE OEYAMA NICKEL MINE,KYOTO PREFECTURE,JAPAN...micrographs Oepama nickeliferous are not uniform sepiolite this from the was be the agree from and...mineral first recorded with those X‑ray sepiolite mine 12 chemical in and length this mineral... properties described mineral from sepiolite occurrence mineralogical sepiolites mineral analysis...a red‑brown surface. Takimoto(1939)described clay,the the the by the sizes northeastern mountains) |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 56, No. 2, 244–258, 2008. THE OCCURRENCE AND GENESIS OF CLAY MINERALS ASSOCIATED...with appreciable amounts of palygorskite. These minerals are also accompanied by trace amount of illite...originated from eolian dust, detrital carbonate minerals, and/or other caliche materials, which are dissolved...1346/CCMN.2008.0560208 Copyright # 2008, The Clay Minerals Society Galán and Ferrero, 1982; Inglès and...were prepared for analysis by separation of the clay fraction (<2 mm) by sedimentation, followed by centrifugation |  | Clauer, Norbert, Fallick, Anthony E., Galán, Emilio, Pozo, Manuel, Taylor, Christopher (2012) Varied crystallization conditions for Neogene sepiolite and associated Mg-clays from Madrid Basin (Spain) traced by oxygen and hydrogen isotope geochemistry. Geochimica et Cosmochimica Acta, 94. 181-198 doi:10.1016/j.gca.2012.07.016 | Journal (article/letter/editorial) | | Varied crystallization conditions for Neogene sepiolite and associated Mg-clays from Madrid Basin (Spain)...2012 Abstract d18O–dD measurements were made on sepiolite and associated saponite and kerolite–stevensite...fluids and the crystallization temperature on these minerals in specific continental crystallization environments...Preliminary experiments of progressive heating of pure sepiolite and saponite under vacuum allowed to set a pretreatment...200 °C to remove the non-bonded water of both sepiolite and smectite before analysis of the structural |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 59, No. 3, 286–314, 2011. MINERALOGICAL AND GEOCHEMICAL CHARACTERISTICS...CHARACTERISTICS AND GENESIS OF THE SEPIOLITE DEPOSITS AT POLATLI BASIN (ANKARA, TURKEY) M U A Z Z EZ Ç E L IK K A...Polatlı contain commercial sepiolitic clay deposits. The sepiolite-rich Polatlı basin sediments were studied...studied to describe the sepiolitic clay deposits of the area and to assess the environments of formation...depositional environments. These sepiolite-rich deposits include sepiolite, dolomite, and calcite, with minor |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals. Vo!. 42, No. 1,81-92,1994. GEOLOGY, OCCURRENCE, AND GENESIS OF ESKiSEHiR SEPIOLITES...Istanbul, Turkey Abstract-The occurrences of sepiolite beds and nodules in alkaline and saline Miocene...rocks for sepiolite nodules (meerschaum). The Miocene succession consists of calcareous clay, clayey carbonate...gypsumbearing calcareous clay series, siliceous tuffs, sepiolite beds, sepiolite-bearing dolomite, and basal...basal conglomerates of ultramafic rocks. Sepiolite beds were deposited by direct precipitation from Si-supersaturated |  | Karakaya, N., Karakaya, M. Çelik, Temel, A., Küpeli, Ş., Tunoğlu, C. (2004) Mineralogical and chemical characterization of sepiolite occurrences at Karapinar (Konya Basin, Turkey) clays and clay minerals, 52 (4) 495-509 doi:10.1346/ccmn.2004.0520410 | Journal (article/letter/editorial) | | Clays and Clay Minerals, Vol. 52, No. 4, 495–509, 2004. MINERALOGICAL AND CHEMICAL CHARACTERIZATION...CHARACTERIZATION OF SEPIOLITE OCCURRENCES AT KARAPINAR (KONYA BASIN, TURKEY) N . K A R A KA Y A 1 , M . Ç E L IK K A...which locally contain sepiolite-rich layers. The mineralogical composition of sepiolite samples taken from...and calcite are the main carbonate minerals in the sections. Sepiolite occurs primarily with dolomite and...sepiolitic layers. The average structural formula of sepiolite was calculated as: (Mg 7 . 0 0 Al 0 . 4 4 Fe 0 |  | | Journal (article/letter/editorial) | | often contain large amounts of the clay minerals palygorskite and sepiolite. Marine sediments generally do...Metasomatism Hydrothermal alteration Palygorskite Sepiolite Geochemical constraints Continental collision...whiteschists. These rocks are mainly composed of clay, chert, calcareous, and siliceous ooze and silt/sand...modal amounts of palygorskite, an Al- and Mg-rich clay mineral with the general mineral formula Mg5yz...Al)4Si8O20(OH)2*8H2O. Together with other clay minerals like montmorillonite and sepiolite, palygorskite—formerly also |  | | Journal (volume) | | 6. 7. 8. 9. v XIII PAPERS K. J. NEUVONEN, Minerals of the katungite f10w ......... . ........ . ...Kuusamo, Finland .. . . ERKKI AUROLA, The fibrous sepiolite deposit of Stansvik ..... . ........ JUHANI SEITSAARI...pplied and theoretical geology in Finland. 1 MINERALS OF THE KATUNGITE FLOW 1 BY K. J. NEUVONEN ...optical properties and d ensity values of the minerals are given . The Katunga volcano, surrounded by...phenocrysts in an aphanitic groundmass and zeolite minerals fill numerous small vesicles and fine veinlets |  | | Journal (volume) | | 6. 7. 8. 9. v XIII PAPERS K. J. NEUVONEN, Minerals of the katungite f10w ......... . ........ . ...Kuusamo, Finland .. . . ERKKI AUROLA, The fibrous sepiolite deposit of Stansvik ..... . ........ JUHANI SEITSAARI...pplied and theoretical geology in Finland. 1 MINERALS OF THE KATUNGITE FLOW 1 BY K. J. NEUVONEN ...optical properties and d ensity values of the minerals are given . The Katunga volcano, surrounded by...phenocrysts in an aphanitic groundmass and zeolite minerals fill numerous small vesicles and fine veinlets |  | | Journal (article/letter/editorial) | | Clays and Clay Minerals , Vol. 54, No. 5, 555±570, 2006. GEOLOGY, MINERALOGY AND ORIGIN OF CLAY MINERALS...laminated sediments, paleosols, calcrete, the occurrence of boneand teeth-bearing reworked pyroclastic...hypersthene), and locally trace amounts of gypsum and sepiolite. Smectite predominates in paleosols and calcrete...between irregular clay nodules in paleosol and calcrete samples, along with the occurrence of dogtooth-type...Cappadocian Volcanic Province, Central Anatolia, Clay Minerals, Paleoenvironment, Paleosol, Turkey. Abstract |
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