Mineral chemistry of some agates from Gurasada (Mures Valley, Romania)

Toda, Dorel Petru; Iancu, Ovidiu Gabriel

doi:10.5038/1937-8602.54.1.8

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…pyroclastic andesite formations, extending from Săvârșin to Bretea Mureșană (Gherasi et al 1965;Lupu et al 1991;Lupu et al 1986) ( Figure 6). In at least some places, jasper (Constantina 2008;Iancu & Iancu 2009) is related to Late Cretaceous andesitic to dacitic pyroclastic rocks, so-called banatites (Giușcă et al 1966).…”

Section: Metalifeiri Jaspers (Two Types)mentioning

confidence: 99%

An overview of the knapped stone economy at the Tărtăria site (Romania)

Crandell

2016

JLS

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This study focused on sourcing the lithic artefacts from the Tărtăria site in the Transylvanian Basin. The objective was to establish a model of the procurement patterns of the population at the settlement. This site is located along the middle region of the Mureș River and has several habitation levels belonging to the Vinča A, Vinča B, Vinča-Turdaș (or Vinča C), Petrești and Coțofeni cultures (Middle Neolithic to Chalcolithic). Most of the results of this study are based on analysis of the artefacts from Iuliu Paul’s excavation in 1989. This knapped artefacts from the Tărtăria site were categorised by tool type, signs of usage and retouch, and probably geographic origin. The sources of the artefact materials were predicted based on macroscopic and petrographic analyses (polarized light optical microscopy). The lithics appear to be made from the same types of materials found at other contemporary sites in the area. As with other sites, the most common imported material is obsidian, followed by Moldavian flint. Balkan flints represent only a small part of the assemblage. Of the local material, the vast majority is chert, likely local Trascău Mts. chert, which represents over half of the pieces in the assemblage. Although the site is closer to sources of jasper in the Metaliferi Mts. than some other Neotlihic and Chalcolithic sites down river, very few of the artefacts were made from jasper. (This may be due to an economic connection with nearby and contemporary, quarrying activity at the Piatra Tomii site.) Obsidian is used almost exclusively for blades and flakes. The same is true for Moldavian flint, although scrapers were not uncommon. Cores and scrapers are more common among local material than among imported material. The percentages of each artefact type seem to remain relatively similar for each culture (i.e. with the progress of time). This shows that people were still using the same general types of tools. The percentages of the different materials varies over time though. During the Vinča A and Vinča B phrases, local materials represent approximately 30% of the assemblage and imported materials represent c. 70%. After the Vinča B phase (i.e. entering into the Chalcolithic), the emphasis switches to local sources (representing c. 87%) while imported drop to c. 13%. Two important observations can be made from this study. Firstly, with the possible exception of Balkan flint, the imported materials came from outside of the territories of the cultures at this site. This indicates that areas of similar artistic style (the main characteristic used to define culture areas) do not in fact match areas of economic interaction. This further supports the need for a redefining of cultures and cultural territories. Secondly, although the inhabitants during the Late Neolithic and Chalcolithic used imported materials (especially obsidian), local materials became more and more predominant over time, possibly due to the introduction and continually increasing value of copper or increased self-sufficiency. The fact that this shift in material usage occurs most drastically during the transition to the Chalcolithic supports this idea.

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Section: Metalifeiri Jaspers (Two Types)mentioning

confidence: 99%

An overview of the knapped stone economy at the Tărtăria site (Romania)

Crandell

2016

JLS

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Mineralogy of agate gemstone in Quaternary deposits, Southeastern Basrah, Iraq

Soltan

Mahdi

2022

IOP Conf. Ser.: Earth Environ. Sci.

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A mineral-geological study was conducted for the dispersion agate that spread on the surface of the Dibdibba desert within the border of Basrah Governorate -Southern Iraq. The collected stones were studied using polarized microscopy, XRD and EDX- SEM techniques to determine their mineral and chemical composition. Five types have been distinguished: white, colloidal, banded, cluster, and fleshy. It is believed that these stones are part of the gravels that are included in the components of clastics Dibdibba Formation, it forming resulting of the erosion of the igneous and metamorphic rocks that related to Arabian Shield, which were moved by torrential waters and seasonal floods to long distances and cumulated in that area. Several mechanical operations affected these stones like crushing, sorting, and polishing which contributed to their appearance and exposure on the surface of the earth.

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Gemstone deposits of Serbia

Miladinović¹,

Šimić²,

Jelenković³

et al. 2016

Geologica Carpathica

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Gemstone minerals in Serbia have never been regarded as an interesting and significant resource. Nevertheless, more than 150 deposits and occurrences have been recorded and some of them preliminarily explored in the last 50 years. The majority of deposits and occurrences are located within the Serbo-Macedonian metallogenic province and the most significant metallogenic units at the existing level of knowledge are the Fruska Gora ore district, Cer ore district, Sumadija metallogenic zone, Kopaonik metallogenic zone and Lece-Halkidiki metallogenic zone. The most important genetic type of deposits is hydrothermal, particularly in case of serpentinite/peridotite as host/parent rock. Placer deposits are also economically important. The dominant gemstones are silica minerals: chalcedony (Chrysoprase, carnelian, bluish chalcedony etc.), jasper (picture, landscape, red etc.), common opal (dendritic, green, milky white etc.), silica masses (undivided), and quartz (rock crystal, amethyst etc.). Beside silica minerals significant gemstones in Serbia include also beryl (aquamarine), garnet (almandine and pyrope), tourmaline, fluorite, rhodochrosite, carbonate-silica breccia, carbonate-silica onyx, silicified wood, howlite, serpentinite, marble onyx, and kyanite. This paper aims to present an overview of Serbian gemstone deposits and occurrences and their position based on a simplified gemstone metallogenic map of Serbia, as well as genetic-industrial classification of gemstone deposits and gemstone varieties.

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Mineral chemistry of some agates from Gurasada (Mures Valley, Romania)

Cited by 3 publications

References 9 publications

An overview of the knapped stone economy at the Tărtăria site (Romania)

An overview of the knapped stone economy at the Tărtăria site (Romania)

Mineralogy of agate gemstone in Quaternary deposits, Southeastern Basrah, Iraq

Gemstone deposits of Serbia

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