390 
THE GEOLOGIST. 
2. Quartz, Hornstouc, Brown-spar, Calc-spar, and Spatliic-iron arc 
combined with Argentiferous galena, Blende, Arsenical pyrites. 
Argentiferous pyrites, and Copper-pjTites in moderate quantities. 
More rarely, and particularly in druses, there are found Chlorite, 
Barj'te, Fluor-spar, Fahlerz, Rothgiltigerz, &c. : red-iron is found as 
a so-called " eisemcr Hut" or "gozzan" to the foregoing. This com- 
bination has been named the " Lead-pyiites formation," and pre- 
dominates east and south of Freiberg. About three hundred veins 
have been found belonging to it, and their direction is mostly forty- 
five degi'ees east of north. This combination is intimately connected 
with the following — • 
3. Brown-spar, Manganese-spar, and Quartz, with Calc-spar, Ba- 
ryte, Spathic-iron, Argentiferous galena, Argentiferoiis blende, 
Argentiferous pyrites. Arsenical pyrites, Rothgiltigerz, native Silver, 
Federerz, &c., often forming symmetrical layers in definite succes- 
sion. Red Iron occurs as a gozzan. Over three himdred veins, 
mostly bearing forty-five degrees east of north, or north and south, 
belong to this " gi-eat Lead-formation," which, like the foregoing, is 
more particularly developed east and south of Freiberg. 
4. Baryte and Fluor-spar predominate, and alternate with Galena 
in many thin and regular layers. With these are associated, 
particularly in the druses in the middle of the vein, Quartz, 
Spathic-iron, Calc-spar, Brown-spar, Iron-pyrites, brown Blende, 
richly Ai'gentiferous fahlerz. Copper-pyrites, Rothgiltigerz, native 
Arsenic, Rauschgelb, Grauspiessglaserz, native Silver, Glaserz, 
&c. The veins of this " Barytes-lead formation," wliich mostly 
bear forty-five degrees east of south, predominate in the neigh- 
bourhood of Halsbriicke. We have counted about one hundred 
and thirty. 
These four combinations or formations may, perhaps, in considera- 
tion of the gi-eat similarity of the 2nd and 3rd, be reduced to three, 
of which the most general characteristics are as follows : — 
I. Quartz and Homstone, with many fragments of neighbouring- 
rock and with noble ores, particularly in di-uses. It predominates 
north and west of Freiberg. 
II. Quartz and Carbonates with Sulphides of metals, partly 
massive, partly disposed in layers. Predominates east of Freiberg. 
