Segers-Glocke, Christiane [Hrsg.]; Niedersächsisches Landesamt für Denkmalpflege [Hrsg.]; Institut für Denkmalpflege [Hrsg.]; Balck, Friedrich [Bearb.]: Arbeitshefte zur Denkmalpflege in Niedersachsen: Aspects of mining and smelting in the Upper Harz Mountains (up to the 13th/14th century) - in the early times of a developing European culture and economy (St. Katharinen: Scripta Mercaturae Verl., Heft 22.2000)

56

Slag
SiO2
FeO
AI2O3
ZnO
CaO
K2O
CuO
s/so4
MgO
PbO
BaO
1384/T
21.2
59.8
5.9
5.1
1.6
1.5
1.0
1.4
0.5
0.3
0.1
1382/P
20.0
61.0
5.2
5.1
1.6
1.4
1.1
2.4
0.5
0.4
0.1

Table 1.
X-ray fluorescence analysis data of tapped (T) and plate (P) copper slags of the excavation
„Schnapsweg“, given a usual as oxides, and in wt.-%.

Consequently, both slag kinds originate from the same smelting. Mineral
phases are fayalite, wiistite, spinel, leucite, copper-iron sulfide, and glass. A SEM
nieture of a tapped slag is shown below (No. 419-159).


Fig. 1 SEM photograph of the tapped copper slag, no. 419-159, with light wüstite
dendrites, grey fayalite ridges and spherical sulphide droplets in a glass matrix (200:1).