Petercsák Tivadar – Váradi Adél szerk.: A népvándorláskor kutatóinak kilencedik konferenciája : Eger, 1998. szeptember 18-20. / Heves megyei régészeti közlemények 2. (Eger, 2000)
X-Ray Diffractometric and Electron Microprobe Study of Avar Period Glass Beads. Basic data for the genetics of glass beads III. Inclusions in the beads
AVAR KORI ÜVEGGYÖNGYÖK.. 159 powder melted but the colouring grains did not melt. The applied technology resulted again in bubbles. Fe-Ca-silicate (Fig. 12) and Ca-silicate (Fig. 13) phases crystallised from the melt were often observed attached to copper and iron inclusions in red and black glasses. Their origin can be connected to the slow cooling in a reductive environment. Copper-chloride inclusion have been identified in the sheet copper threading tube of the translucent, light green glass bead No. 6 from Csongrád-Felgyő (Figs 7/6 and 14). It can be supposed from Theophilus's report (THEOPHILUS 1983; OBERFRANK 1996) that the copper sheet used for the threading tube was earlier used at the production of the material applied at gold soldering. This glass bead must have been Fórizs István MTA Geokémiai Kutatólaboratóriuma 1112 Budapest Budaörsi út 45. E-mail: forizs@sparc. core, hu Pásztor Adrién 1136 Budapest Hegedűs Gyula u. 40. I. e. 1. made in a workshop where goldsmiths worked as well. Microtextural studies of glass beads from Avar period (6 t h-7 t h centuries) and morphological and chemical composition analyses of their inclusions were carried out. As far as we know no similar studies have been made from this period. At the evaluation of the data we could demonstrate for the red and the yellow colours that the glass beads were made in two basic phases: 1. Raw glass (frit) production, 2. The powdered raw glass was mixed with the also powdered colouring materials, than the mixture was melted and the beads were shaped at a strictly determined temperature range (a similar process could be followed in the case of opaque glasses of other colours as well). Traslated by Katalin Simán Tóth Mária MTA Geokémiai Kutatólaboratóriuma 1112 Budapest Budaörsi út 45. Nagy Géza MTA Geokémiai Kutatólaboratóriuma 1112 Budapest Budaörsi út 45.
