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Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits from the Late Neolithic, the Early and Late Iron Age, and the Roman Period. Volume 1. The Late Neolithic pit field, National Institute of Archaeology and Museum BAS, Edited by K. Bacvarov, M. Tonkova and G. Katsarov, 561-565 (in Bulgarian with English abstract). Цанкова Н., М. Василева. 2017. Минераложко и петрографско изследване на малахит-съдържащи образци.- В: Сърнево. Вкопани структури от късния неолит, ранната и късната желязна епоха и римския период. Том 1, Къснонеолитното ямно поле, НАИМ-БАН, К. Бъчваров, М. Тонкова и Г. Кацаров (ред.), 561-565 (резюме на английски език). 21. Mineralogical, petrographic and gemological analyses of mineral artifacts (Summary) 21.1. Mineralogical and petrographic analysis of malachite containing samples Nikoleta Tzankova and Margarita Vasileva This chapter section considers the results of the mineralogical and petrographic analysis of two malachite containing samples from the Late Neolithic pit field at Sarnevo. In order to localize their place of origin, a complex of analytical techniques was used: microscopic observation in transmitted and reflected light, electron microprobe analyses, X-ray powder diffraction analyses and ICP-AES. The malachite in the samples is observed in association with iron hydroxides (goethite), quartz, libethenite (confirmed with XRD), and fine sulphide relicts: chalcocite-type phases. The ICP–AES analyses identified higher concentrations of Fe (13762 mg/kg), S (2406 mg/kg), and Zn (585.0 mg/kg); relatively higher concentrations of Mn (170.7 mg/kg), Cr (110.3 mg/kg), and Ni (99.1 mg/kg); as well as lower concentrations of As (21.3 mg/kg), Ag (15.1 mg/kg), and Pb (11,2 mg/kg). The analyzed malachite containing samples have significantly similar geochemical properties as the malachite ores at Ai Bunar and Tamnyanka, but the results are not yet sufficient to make definite conclusions.

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Page 1: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits

Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of

malachite containing samples.- In: Sarnevo. Pits from the Late Neolithic, the Early

and Late Iron Age, and the Roman Period. Volume 1. The Late Neolithic pit field,

National Institute of Archaeology and Museum – BAS, Edited by K. Bacvarov, M.

Tonkova and G. Katsarov, 561-565 (in Bulgarian with English abstract).

Цанкова Н., М. Василева. 2017. Минераложко и петрографско изследване на

малахит-съдържащи образци.- В: Сърнево. Вкопани структури от късния

неолит, ранната и късната желязна епоха и римския период. Том 1,

Къснонеолитното ямно поле, НАИМ-БАН, К. Бъчваров, М. Тонкова и Г.

Кацаров (ред.), 561-565 (резюме на английски език).

21. Mineralogical, petrographic and gemological analyses of mineral

artifacts (Summary)

21.1. Mineralogical and petrographic analysis of malachite containing

samples

Nikoleta Tzankova and Margarita Vasileva

This chapter section considers the results of the mineralogical and

petrographic analysis of two malachite containing samples from the Late Neolithic

pit field at Sarnevo. In order to localize their place of origin, a complex of analytical

techniques was used: microscopic observation in transmitted and reflected light,

electron microprobe analyses, X-ray powder diffraction analyses and ICP-AES. The

malachite in the samples is observed in association with iron hydroxides (goethite),

quartz, libethenite (confirmed with XRD), and fine sulphide relicts: chalcocite-type

phases. The ICP–AES analyses identified higher concentrations of Fe (13762 mg/kg),

S (2406 mg/kg), and Zn (585.0 mg/kg); relatively higher concentrations of Mn (170.7

mg/kg), Cr (110.3 mg/kg), and Ni (99.1 mg/kg); as well as lower concentrations of

As (21.3 mg/kg), Ag (15.1 mg/kg), and Pb (11,2 mg/kg). The analyzed malachite

containing samples have significantly similar geochemical properties as the

malachite ores at Ai Bunar and Tamnyanka, but the results are not yet sufficient to

make definite conclusions.

Page 2: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits
Page 3: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits
Page 4: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits
Page 5: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits
Page 6: Nikoleta Tzankova and Margarita Vasileva - gemologia.eu · Tzankova N., M. Vasileva. 2017. Mineralogical and petrographic analysis of malachite containing samples.- In: Sarnevo. Pits

Цитирана литература: Черных, Е. Н. 1978. Горное дело и металлургия в Древнейшей Болгарии, БАН,

София, 396 стр. Богданов, Б. 1987. Медните находища в България, Техника, София, 389 стр. Ковачев, В. 1994. Медни рудни находища в България и възможностите за

тяхната експлоатация в древността. Сб. „Проблеми на най-ранната металургия”, Тр. МГУ, 4, София, 90-119 стр.

Токмакчиева, М. 1994. Минерален състав, геохимични особености и генезис на медните минерализации от Панагюрско-Етрополския руден район, изд. АСИ-ООД, С, 458 с.

Токмакчиева, М. 2003. Минераложки особености на супергенните минерализации от медните находища в Централното Средногорие. Год. МГУ, 46, 1, 213-218.