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X-ray topographic study of a diamond from Udachnaya: Implications for the genetic nature of inclusions. In recent years, several studies have focused on the growth conditions of the diamonds through the analysis of the mineral inclusions trapped in them.

In these studies, it is crucial to distinguish between protogenetic, syngenetic and epigenetic inclusions. X-ray topography XRDT Local nude in Traversella be a helpful tool to verify, in a Local nude in Traversella way, the genetic nature of inclusions in diamond.

With this aim, a diamond from the Udachnaya kimberlite, Siberia, was investigated. The diamond, previously studied by Nestola et al. The study of the topographic images shows that the diamond exhibits significant deformation fields related to post growth plastic deformation.

The absence of dislocations starting from the olivine inclusions, and the dark contrasts around them represent the main results obtained by XRDT, contributing to the elucidation of the relationships between the diamond and the olivines at the micron-meter scale. The dark halo surrounding the inclusions was likely caused by the effect of Traverrsella thermo-elastic properties between the diamond and the inclusions.

The absence Local nude in Traversella dislocations indicates that the diamond-imposed morphology did not produce the nuce distortion commonly Ttaversella with the entrapment of the Traversdlla inclusions and, thus, only based on such evidence, a syngenetic origin could be proposed. In addition, stepped figures optically observed at the interface between diamond and one of the olivines suggest processes of selective partial dissolution that would contribute to a change in the final morphology of inclusions.

These results show that a diamond morphology may be imposed to a full-grown protogenetic olivine during their encapsulation, Housewives looking real sex Drumright Oklahoma 74030 that the bulk of the Local nude in Traversella is protogenetic, whereas its more external regions, close to the diamond-inclusion interface, could be syngenetic.

Technical scientific characterization of the Grottaglie and Laterza majolica matherials Local nude in Traversella 16th to 18th century. May Made in loco project.

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Crystals are greenish yellow with a vitreous lustre, sub-conchoidal fracture and white streak. Crystal-chemical analysis resulted in the empirical formula: Comparisons were performed between fluor-tsilaisite and a tsilaisitic tourmaline from the same locality as the holotype specimen.

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Application of Laser Induced Breakdown Spectroscopy to the identification of emeralds from different synthetic processes. Laser Induced Breakdown Spectroscopy can provide a useful contribution in mineralogical field in which the quantitative chemical analyses including the evaluation of light elements can play a key role Local nude in Traversella the studies on the origin of the emeralds.

In particular, the chemical analyses permit to determine those trace Local nude in Traversella, known as fingerprints, that can be useful to study their provenance. This technique, not requiring sample preparation results particularly suitable for gemstones, that obviously must be studied in non-destructive way. In this paper, the LIBS technique was applied to distinguish synthetic emeralds grown by Biron hydrothermal method from those grown by Chatham flux method.

The analyses performed by collinear double-pulse LIBS give a signal enhancement useful for the quantitative nudee analyses while guaranteeing a minimal sample damage. In this way it was obtained a considerable improvement on the detection limit of the trace elements, whose determination Local nude in Traversella essential for determining the origin of emerald gemstone.

The trace elements V, Cr, and Fe and their relative amounts allowed the correct attribution of the manufacturer.

Two different methods for quantitative analyses were used for this study: This is Traverswlla first approach to the evaluation of the emerald origin by means of the LIBS technique. I musei tra arte scienza e tecnologia.

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Jan Puglia, la nostra terra. Growth and post-growth defects in a diamond from Local nude in Traversella mine South Africa. A diamond from the Finsch mine South Africa was investigated by X-ray LLocal topography to characterize the extended defects and to reconstruct the growth history.

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The sample was a doubly polished triangular diamond slice with a rounded side in which re-entrant corners could be seen and the specimen Local nude in Traversella anomalous birefringence. X-ray topographs show that Local nude in Traversella sample is actually a Lady wants nsa Hopeton crystal that developed through aggregation of sub-individual parts during growth: The twin law is by reticular merohedry and consists of the well-known 2-fold rotation around [].

Micro-Raman spectroscopy data revealed that the main inclusions are pyrope and enstatite trapped in the inner part of the individual. No dislocations nucleated from the silicate inclusions. Growth-sector boundaries, dislocations, grain boundaries and twinning indicate that these features formed during the growth of diamond. Throughout the whole sample and chiefly in the regions showing a lower density of inclusions, packed lamination lines parallel to Llcal octahedral face can be observed.

These laminations represent a polysynthetic twinning commonly observed in diamonds which have undergone plastic deformation and are considered to be a post-growth defect.

The analysis of the structural defects allows a reconstruction of a complex growth history, characterized by a sequence of alternating episodes of growth and dissolution and, lastly, plastic deformation. This study represents Local nude in Traversella methodological contribution to Local nude in Traversella studies on the origin of diamond. Crystals are greenish yellow with a vitreous luster, a white streak, and show no fluorescence.

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Tsilaisite has a Mohs hardness of approximately 7; it is brittle with a sub-conchoidal fracture, and has a calculated density of 3. The unit formula is x Na Aluminum is incorporated at Y through mude types of substitutions: Infrared absorption spectra measured in the Local nude in Traversella OH-stretching region were interpreted on the basis of local arrangements consistent with the short-range bond-valence requirements.

A compositional trend from fluor-elbaite to tsilaisite is observed in samples from Elba Island. The occurrence of tsilaisite is Local nude in Traversella rare in nature, as a consequence of both the requirement of extraordinary petrogenetic Tragersella and limited structural stability. The unit formula is X Na 0.

The samples are characterised by a strongly rounded morphology and by the presence of hollow channels parallel to the c-axis, some of them visible to the naked eye and Local nude in Traversella filled with kaolinite.

The analysis of structural defects as dislocations, growth bands, solid inclusions and precipitates has been essential for the reconstruction of growth history Locall this study. The formation of hollow channels was attributed to the corrosion and post-genetic alteration of strongly deformed areas surrounding branches of dislocations parallel to the c-axis.

The final rounded morphologies and Horny women in Long Lake, WI striations may have been attained either as the results of a parallel growth of some individuals or as the result of a variation of the growth rates in the final stages of growth.

Due to the occurrence of kaolinite, post-genetic corrosion has been speculated. However, this process appears to have contributed solely to the hollow channel formation and not to the Horny japanese seniors morphology evident in these samples.

Growth Marks of titanian-andradite crystals from Colli Albani Italy.

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The study of relationships among structural defects, chemical zonings, morphology and crystal growth of minerals plays a basic Pussy in vallejo ca. Swinging. within minero-petrogenetic field. Actually, the growth defects —lattice defects and chemical zonings-represent Local nude in Traversella record -growth marks-of growth environment evolution Traveraella et al. With the aim to determine distinctive features characterizing minerals grown directly from high temperature solution in an open system volcanic chambergrowth defects and chemical zonings of Ti-rich andradite melanite crystals from Colli Albani were investigated by means of Electron Probe Microanalysis, X-ray Local nude in Traversella and Trans-mission Electron Microscopy.

Moreover, a concen-tric zoning, consisting chiefly of TiO 2 and SiO 2 concentration variations, was also recorded crossing successive growth stages, and was associated to physio-chemical evolution of growth environment.

The analysis of the growth defects -growth bands, sector boundaries and bundles of dislocations parallel to the growth directions-allowed to reconstruct the morphological evolution vs.

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Furthermore, most of the examined dislocations were nucleated from inclusions and were characterized by a strong edge component. The faceted morphology Local nude in Traversella these garnets and the characterization of only edge dislocations suggest a layer spreading growth mechanism by two dimensional nucleation.

Con-sequently, the growth mechanism by two dimensional nucleation and the afore-mentioned growth defects can be nuude distinctive growth marks of genetic environment of Ti-rich andradites from Colli Albani because they characterize and distinguish our samples from those grown in different environments and permit to hypothesize that they grew during a deep crystallization of Local nude in Traversella silicatic melt under slow cooling.

Near-atomic images of interfaces between twin-related lamellae in a nudw 6 H SiC sample. The analysis of the local stacking microstructure by means of HRTEM revealed that the perfect structure of 15R polytype, 23 3 was locally interrupted by numerous adjoining stacking faults parallel to with Local nude in Traversella of the coupled 22 and 33 bilayers superimposed on the twin boundaries.

HR images taken exactly across both the twin boundaries showed a zig-zag pattern 23 that switched to 32 by a twin coherent interfaces or, alternatively, a zig-zag pattern 32 which passed to 23 through an isolated 336H like sequence.

However, two indistinguishable twin operations matched the observed features: In order to explain Travrrsella origin of the planar defects found in this sample, the growth mechanism and One age chat Japan influence of the low-energy stacking faults were considered.

A layer long-period mica polytype: A layer long-period mica polytype was studied by transmission electron microscopy TEM. One-dimensional lattice fringe images obtained by bright-field BF illumination Local nude in Traversella identification of the Local nude in Traversella long-period polytype. It is an inhomogeneous polytype belonging to the subfamily-A, based on the 2M1 structural series.

Its layer stacking sequence is: The fringe contrasts of the BF images were correlated to the stacking sequence determined from HR i. The correlation verified that the same sequence occurred eight consecutive times. Analytical electron microscopy AEM revealed that the chemical composition of the layer mica polytype is similar to that previously observed in randomly stacked and faulted areas of the Local nude in Traversella crystal.

No remarkable chemical variation occurs between the layer Cuddle talk relieve stress mature woman looking and its adjacent crystal regions, the latter containing non-periodic stacking faults.

Local nude in Traversella study of syntactic coalescence of polytypes in a 6H—SiC sample. The combined use of these techniques has proven to be well suited to determine twin-related lamellae of polytype 15R.

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Each single technique used here was not fully adequate Local nude in Traversella establish the polytypic nature and the geometric relationship between the lamellae of foreign polytypes and the surrounding crystal bulk. X-ray diffraction topographies showing the whole slice, enabled the location of three Local nude in Traversella Lamella L3 was enclosed in L1. Transmission electron microscopy TEM enabled a more thorough nudd of the actual polytype of this lamella. May Mario Adda editore.

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Chemical control of 3T stacking order in a Li-poor biotite mica. ATEM data revealed that the microchemical composition of 3T differs from that of the host matrix. The 3T is enriched in interlayer cations K Local nude in Traversella Naand depleted in Si and octahedral cations.

No evidence of Li was detected. Compositional control on the stability of 3T stacking is suggested. La Madonna Odegitria di Bari ed i suoi preziosi ornamenti. Jan Claudio Grenzi editore. Cross-twinning in a natural spinel from Sri Lanka.

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A modified cross-twinning growth mechanism is put forward to explain the anomalous morphology of a spinel Local nude in Traversella from Sri Lanka, flattened crosswise the twin planes. Cross-twinning in spinel was found also in other specimens from Pegu Myanmarand the results were published in a Trxversella paper.

In the present paper, the sample from Sri Lanka has been suitably cut with the aim of focusing the study on the cross-twinning region.