Characterization of silica phases from the region of village Devintzi, Kardzhali District

Pazderov R., N. Tzankova, Y. Yordanov, P. Yordanova. 2017. Characterization of silica phases from the region of village Devintzi, Kardzhali District – Jubilee Scientific Conference 50 Years of Museum Activity in the Eastern Rhodopes – studies, research, perspectives, 17-18 September 2015 г., conference proceeding 2017, Print, 10-18.

Radostin Pazderov¹, Nikoleta Tzankova¹, Yordan Yordanov², Petia Yordanova³

¹ University of mining and geology “St. Ivan Rilski”, Sofia

² “Geokonsult”, Bourgas,

³ Regional historical museum, Bourgas

Abstract: A relatively recently known occurrence of silica mineralization from the region of village Devintzi, Kardzhali district, is studied. It outcrops in linear zones and concentric formations, which in their central parts are generally made of carbonate materials, and to the periphery – from colorful striped SiO₂-phases including carnelian. SiO₂-phases are represented mainly by chalcedony and in minor quantity by quartz, tridymite, quartzine, and opal. Three morphological types of chalcedony are established – spherulitic, granular and radial fibrous chalcedony. Tridymite and celadonite are defined using XRD.

A large embankment slope with domed shape, in the western part of the studied occurrence, is surmised to be with a man-made origin, related to the ancient episodic extraction of raw agate suitable for making jewelry and especially glyptics.

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