An easy non-invasive X-ray diffraction method to determine the composition of Na-pyroxenes from high-density `greenstone' implements

Giustetto, Roberto; Chiari, Giacomo; Compagnoni, Roberto

doi:10.1107/s0108767307062691

Cited by 12 publications

(13 citation statements)

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“…Las reflexiones que por ser las más intensas, estar próximas y bien separadas presentan mejores características para la identificación de fases son la 221 y la 310 (D'Amico et al 1995;2003;Chiari et al 1996b;Giustetto et al 2008). Ambos planos [hkl 221 y 310] presentan variaciones significativas en toda la serie de soluciones sólidas pasando de 30,70-31,60 º2θ (jadeíta) a 29,84-30,27 º2θ (Wo+En+FS) respectivamente con valores intermedios para la Aegirina (Giustetto et al 2008). Es, por tanto, esta región la que se utiliza para identificar la presencia de jadeíta/onfacita (D'Amico et al 1995;2003;Giustetto et al 2008).…”

Section: Resultsunclassified

“…Ambos planos [hkl 221 y 310] presentan variaciones significativas en toda la serie de soluciones sólidas pasando de 30,70-31,60 º2θ (jadeíta) a 29,84-30,27 º2θ (Wo+En+FS) respectivamente con valores intermedios para la Aegirina (Giustetto et al 2008). Es, por tanto, esta región la que se utiliza para identificar la presencia de jadeíta/onfacita (D'Amico et al 1995;2003;Giustetto et al 2008). Las fases que se identifican por norma general no son fases puras y la cristalización, por tanto, suele ser una mezcla heterogénea de distintos cristales dentro de la serie, por lo que es posible que existan desplazamientos de las difracciones dentro los rangos anteriormente citados, a lo que hay que añadirle un posible desplazamiento debido a que la superficie de medida no es perfectamente plana, y a pesar de que el uso de espejos parabólicos unidos al haz paralelo evitan los problemas de textura de la muestra, no corrigen el desplazamiento o la mala resolución de los picos derivado de una muestra que nos es completamente plana.…”

Section: Resultsunclassified

“…La difracción de rayos X es una técnica barata y de gran resolución que informa acerca de la composición mineralógica, cuantificando groseramente la proporción de piroxenos en la mezcla heterogénea de una solución sólida (Chiari et al 1996a;D'Amico et al 1995;2003;SPAL 25 (2016): 211-227 ISSN: 1133-4525 ISSN-e: 2255 http://dx.doi.org/10.12795/spal.2016i25.08 Giustetto et al 2008). La difracción de rayos X es utilizada para identificar los minerales que componen la pieza.…”

Section: Metodologíaunclassified

“…Aunque según apuntan otros autores (Giustetto et al 2008) estos resultado pueden ser dudosos dado que la asociación/mezcla de diferentes mineralogías puede dar resultados muy similares.…”

Section: Metodologíaunclassified

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El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

Odriozola

Jiménez²,

Blanes

et al. 2016

SPAL

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Resumen: En este trabajo se estudia un hacha pulimentada inédita excepcional depositada en el Museo de Valencina de la Concepción (Sevilla) en noviembre de 2010 y que formó parte de la colección personal de Francisco María Tubino y Oliva (1833-1888). Aunque la procedencia exacta de la pieza es desconocida, existen razones para pensar que podría proceder de algún yacimiento arqueológico de la provincia de Sevilla. Mediante la aplicación de dos técnicas analíticas diferentes (XRD, DCμRS), se identifica la pieza como jade-jadeíta de una pureza superior al 95 ml%, lo que implica su procedencia de los Alpes. En las conclusiones se realiza una valoración de la significación de esta pieza en términos de contactos a larga distancia en la Prehistoria Reciente ibérica. Palabras Clave: Prehistoria Reciente, Hacha Pulimentada, Jade, Espectroscopia µ-Raman, Difracción de Rayos X, Intercambio de Larga Distancia, Comercio Abstract: A polished axe donated to the Valencina de la Concepción Museum (Seville, Spain) in November 2010, and that had belonged to Francisco María Tubino y Oliva's (1833-1888) personal collection, is studied. Although the exact provenance of this object is unknown, there are reasons to think that it might have been found on some archaeological site of the Seville province. Through the application of two different analytical techniques (XRD, DCμRS), this axe is identified as a jade-jadeite of purity above 95 ml%, which necessarily implies it came from the Alps. In the conclusions a discussion of this artifact is made in terms of long distance contact in Iberian Late Prehistory.

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Section: Resultsunclassified

Section: Metodologíaunclassified

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El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

Odriozola

Jiménez²,

Blanes

et al. 2016

SPAL

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“…It is likewise in China, but there the jadeite‐jade is derived from outcrops in Myanmar [Burma] . In several European states like France, where a stone axe is actually the ‘type specimen’ of jadeite, or Luxemburg, there have been numerous finds of these stone axes, but they are most probably derived from the Italian Alps . In fact, the first discovery of jadeitite (and jadeite‐jade) in the Western Alps, in 1903, was made by Franchi .…”

Section: Introductionmentioning

confidence: 99%

Portable Raman verification and quantification of jade in Olmec ceremonial axes from El Manatí, Veracruz, Mexico

Giligny¹,

Smith

Masson³

et al. 2017

J Raman Spectroscopy

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The El Manatí archaeological site in Veracruz State, Mexico, is famous for its deposits of ceremonial stone axes and beads from the Olmec culture. Some of these have been considered to be in jadeite‐jade, but this rock type in these artefacts has never before been physico‐chemically verified. A portable Raman spectrometer was employed in situ inside the Centro‐INAH Veracruz reserve for this remote analytical operation of non‐destructive direct hand‐held analysis to identify some of the mineral species present. The key points of interest were as follows: which objects can correctly be called ‘jade’ because they contain the high‐pressure minerals jadeite or omphacite and, if so, with what mol. % Jd (Jd%) in the solid‐solution jadeite–diopside–hedenbergite. The Jd% value was then quantified from the wavenumber shift of the symmetric Si–O–Si Raman vibration band. Although some artefacts did not yield any usable Raman spectra, exploitable spectra were obtained from 41 stone axes or beads. Jadeite was found in 13 artefacts and omphacite in another 11. Jd% varied from 95 to 38% such that many of these jades are actually omphacite‐jade rather than jadeite‐jade. The complicated terminology of jades is thus re‐examined. A partial correlation is shown to exist between the Jd% value and the density of the artefacts. These results provide important, hitherto unknown, mineralogical data for archaeologists studying artefacts at different horizons at different sites of Mesoamerican cultures. These results also allow these artefacts to be now labelled correctly in their Museum reserve or exhibition display. Copyright © 2017 John Wiley & Sons, Ltd.

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Water‐Soluble Manganese Inorganic Polymers: The Role of Carborane Clusters and Producing Large Structural Adjustments from Minor Molecular Changes

Fontanet

Rodríguez

Fontrodona

et al. 2014

Chemistry A European J

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The reaction of two different carboranylcarboxylate ligands, 1-CH3-2-CO2H-1,2-closo-C2B10H10 or 1-CO2H-1,2-closo-C2B10H11, with MnCO3 in water leads to polymeric compounds 1 a and 1 b. Both compounds have been characterized by analytical and spectroscopic techniques. Additionally, electrochemical techniques have also been used for compound 1 a. X-ray analysis revealed substantial differences between both compounds: whereas a six-coordinated Mn(II) compound with water molecules bridging two Mn(II) centers has been observed for 1 a, a square pyramidal geometry around each Mn(II) ion with terminal water molecules coordinated to each Mn(II) center has been found for 1 b. The observed differences have been attributed to the existence of different substituents, -CH3 or -H, on one of the carbon atoms of the carboranylcarboxylate ligand. The reaction of 1 a and 1 b with coordinating solvents, such as ethers or Lewis bases, leads to the formation of new compounds with low (mononuclear 4 a, 4 b; dinuclear 3 a, 3 b; and trinuclear 2 a) or high nuclearity (hybrid polymer, 5 a), due to breakage of the corresponding polymer. X-ray analysis shows that the structural core present in the polymeric materials is not maintained in the resulting compounds, with the exception of trinuclear compound 2 a. The magnetic properties of the compounds studied show weak antiferromagnetic coupling.

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An easy non-invasive X-ray diffraction method to determine the composition of Na-pyroxenes from high-density `greenstone' implements

Cited by 12 publications

References 16 publications

El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

El hacha pulimentada de jade de la colección Tubino (Museo Municipal, Valencina de la Concepción, Sevilla)

Portable Raman verification and quantification of jade in Olmec ceremonial axes from El Manatí, Veracruz, Mexico

Water‐Soluble Manganese Inorganic Polymers: The Role of Carborane Clusters and Producing Large Structural Adjustments from Minor Molecular Changes

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