Characteristics of a Mg-palygorskite in Miocene rocks, Madrid Basin (Spain) | Zendy

Emilia García Romero | Zendy; Mercedes Suárez | Zendy; María Ángeles Bustillo Revuelta | Zendy

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Characteristics of a Mg-palygorskite in Miocene rocks, Madrid Basin (Spain)

Author(s) -

Emilia García Romero,

Mercedes Suárez,

María Ángeles Bustillo Revuelta

Publication year - 2004

Publication title -

clays and clay minerals

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.314

H-Index - 87

eISSN - 1552-8367

pISSN - 0009-8604

DOI - 10.1346/ccmn.2004.0520409

Subject(s) - palygorskite , sepiolite , octahedron , infrared spectroscopy , scanning electron microscope , crystallography , transmission electron microscopy , mineralogy , spectroscopy , chemical composition , chemistry , clay minerals , geology , analytical chemistry (journal) , materials science , physics , crystal structure , nanotechnology , environmental chemistry , raw material , organic chemistry , quantum mechanics , composite material

Palygorskite in Miocene mudstones, palustrine limestones and calcretes from the Esquivias\udlocality (Madrid Basin, Spain) has been analyzed by X-ray diffraction, infrared spectroscopy, scanning\udelectron microscopy, transmission electron microscopy and analytical electron microscopy to determine its\udcharacteristics and chemical composition. Other palygorskites from the literature are used as references.\udThe mean structural formula obtained from the analysis of isolated particles is\ud(Si7.87ALO.13)O20(Al1.04Fe3+\ud0.20Mg3.11&0.65)(OH)2(OH2)4(Ca0.02K0.05Na0.08). This palygorskite has the\udlargest Mg content reported in the literature, and it seems that, chemically, it fills the ‘compositional\udgap’ existing between sepiolite and palygorskite. Infrared spectroscopy reveals the absence of trioctahedral\udMg and therefore the possibility of the existence of magnesic clusters in the ribbons is discounted. An\udhomogeneous distribution of the octahedral cations (Al, Fe3+ and Mg) along the ribbons is proposed

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