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With the development of the economy, the positive influences of traditional beliefs on the biodiversity conservation have been ignoring and the traditional beliefs have been meeting the serious challe...
Thirty seven soil samples collected from arid and semiarid regions of southern Iran were studied to determine the different forms of potassium and their relation with clay mineralogy and other soil pr...
Translucent pink opals from Mexico (states of Mapimi and Michoacan) and Peru (Acari area, near Arequipa) are opal- CT, containing from 10 to 40 % palygorskite, as demonstrated by XRD, infrared absorp...
Abstract: The matrix of the Pliocene volcaniclastics from the Akrotiri area of the Santorini island (Greece) is dominated by clinoptilolite. Smectite, occasionally illite-smectite, opal-CT, cristobali...
Abstract: A theoretical model describing the interaction between crystalline swelling and cation exchange selectivity is proposed for expanding 2:1 phyllosilicates. The model is based on the assumptio...
Abstract: In the Tertiary lacustrine sediments of the Jbel Rhassoul (Morocco), stevensite and sepiolite, confined to the dolomitic facies, are commonly mixed at lower parts of the so-called “Formation...
Laurelite, Pb7F12CI2,from the Grand Reefmine, Graham County, Arizona, is hexagonal, Po,witha = 10.267(1) and c = 3.9844(4) Aand Z= 1.The crystal structure wassolved bydirect methods and refined to R =...
The crystal structure of namuwite, (Zn,Cu)4S04(OHk4H20, trigonal, a = 8.331(6), C = 10.54(1) A,V=634(1) A3,Pj, Z = 2, has been solved by direct methods and refined to an R index of 7.9% using MoKa X-r...
Westudied pyrite spherules built of radiating crystals to establish the relationships among microstructure, composition, and macroscopic appearance. Results of high-reso-lution transmission electron m...
Coherent inelastic neutron scattering measurements have been performed on a natural garnet pyrope from the Dora Maira Massif, Italian Western Alps, [(M&.92Feo.osCao.o3)3Al2Si3012, space group Ia'Jd, Z...
The porosities of flocs formed from a used drilling mud were determined by measuring sizes and settling speeds of individual flocs. These flocs were produced in a Couette-type flocculator under a vari...
The extent of illite/smectite (I/S) reactions is linked with quantitative measurements of shale fabric in a suite of samples from a lower Frio Formation well. Greater illitization of the I/S clays is ...
Nine hematites and 22 goethites were synthesized by a variety of methods to obtain monomineralic samples having a range of Al substitutions and particle sizes. The second derivative of absorbance and ...
The percentage of expandable layers in illite/smectite (I/S) mixed-layer clay decreases with increasing temperature and depth in a section through marine Cretaceous shales in the Champlin 1 Hartley Fe...
The reaction of smectite to illite in shale from the COST 1 well in the south Texas Gulf Coast and from altered ash-fall tufts from the Morrison Formation in New Mexico was investigated using X-ray po...

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