Electron microprobe analysis (EMPA) is a widely applied technique in the geological sciences and can also be used successfully for archaeometric purposes, e.g. for the study of ceramics. The main advantage is that it allows the identification of components with a wide range of sizes, independent of their nature as primary minerals or firing products. In addition, the minerals can be chemically mapped using Backscattered Electron Image (BSEI) coupled

Sedimentology can shed light on the emplacement of oceanic lithosphere (i.e. ophiolites) onto continental crust and post-emplacement settings. An example chosen here is the well-exposed Jurassic Mirdita ophiolite in southern Albania. Successions studied in five different ophiolitic massifs (Voskopoja, Luniku, Shpati, Rehove and Morava) document variable depositional processes and palaeoenvironments in the light of evidence from comparable settings

Am trimis miercuri primului Ministru al Romaniei, Emil Boc si Minstrului Educatiei, daniel Funeriu, o scrisoare deschisa (semnata pana acum de 65 de persoane). Cum nu am reusit sa incarc pe AdAstra acest document, l-am postat pe pagina mea web. http://bioge.ubbcluj.ro/~corina.ionescu/

Based on their chemical composition ceramic shards from three Bronze Age sites in Transylvania, i.e., Copaceni, Dersida and Palatca respectively, were distinguished by major, trace, and RE elements. Within the Copaceni samples, two subgroups (A and B) showing different chemistry and mineralogy were additionally separated out. The link between chemistry and mineralogy showed clearly the important contribution of the temper to the overall chemistry

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Thermal changes occurred during firing of clays in order to obtain ceramic samples are important for understanding their properties. In the present paper we report results obtained by thermogravimetric (TGA) and differential thermal analysis (DTA) as well as by X- ray diffraction (XRD) on row and high temperature heat treated clay samples used to produce black-ceramic. TGA and DTA data point out characteristic dehydroxylation and decomposition reactions,

Pristine clay samples were characterized by X-ray diffraction, differential thermal analysis and gravimetric thermal analysis, as well as by nitrogen adsorption/desorption method for specific surface area determination. The samples were thermally treated at different temperatures, up to 1200oC, and for different periods of time, up to 8 hours, in order to investigate the effect of heat treatment parameters on their porosity. The heat treatment applied

Mineralogical and petrographic studies of Early Medieval potshards exhumed in the Viile Tecii archaeological site (North Transylvania, Romania) show a ceramic body composed of a microcrystalline to amorphous matrix, various clasts and voids. The microscopical features and XRD patterns indicate that illitickaolinitic clays were used as raw materials, together with quartzitic sands as tempering material. The ceramic vessels were obtained with the potter’s

The Budureasa hydrogarnet appears in the shape of idiomorphic crystals of yellow - brownish color, usually having 2 - 3 mm diameter, sometimes more (5 - 6 mm). The chemical formula of the Budureasa hydrogarnet is: (Ca2,88Mg0,05Fe0,03Mn0,03Na0,03)(Fe1,59Al0,41)[(SiO4)2,89(OH)0,43] and the calculated cell unit lattice parameter is 12.07(1) Å. The infra-red absorption spectrum presents the "hydrogarnet - type substitution" bands. The hydrogarnet is