4S2 
Geology . 
grey-wacke in the Harts. It is even sometimes dissemi- 
nated through the newer porphyry and serpentine. 
c. Yellow orpiment — seems to occur only in flcetz- 
rocks ; whereas red orpiment appears to be confined prin- 
cipally to primitive rocks. 
d \ Pharmacolite , or arsenic-bloom, (Arseniate of Lime 
6>f chemists,) occurs in veins that traverse granite in Fur- 
stenberg ; gneiss and mica-slate in Saxony, and grey- 
wacke in other countries. In Hungary, it occurs along 
with yellow orpiment ; hence it is there probably of new- 
er formation. 
11. Cobalt . — Cobalt- glance is the oldest species of 
cobalt- ore. It occurs, in beds, in mica-slate, and does 
not appear in any of the newer rocks. 
b. Greg Cobalt-ore occurs in veins that traverse gra- 
nite, gneiss, and clay-slate. 
c. White Cobalt-ore occurs more frequently than any 
other species of the cobalt family, and also in a greater va- 
riety of geognostic relations. It occurs in beds and veins ; 
of the latter, two formations are known ; one that occurs 
in primitive, the other in floetz mountains. It occurs also 
in considerable quantity in transition -mountains. The 
veins in primitive mountains, traverse granite, gneiss, 
mica- slate, and clay -slate. The newer formation occurs 
in veins, that traverse the oldest fleet z- limestone. 
12. Nickel. — This metal occurs both in primitive and 
floetz mountains, and also in small portions in transition- 
mountains. In primitive mountains, it is accompanied 
with silver-ores ; in transition-mountains, with lead- ores ; 
and in fleetz- mountains, with copper- ores. In all these 
classes of rocks, it occurs in veins. 
13. Silver. -—This metal occurs in primitive, transi- 
tion, and fitEtz- mountains ; but it would appear, that the 
greatest variety and quantity of native silver, and true 
ores of silver, occurs in primitive mountains; We shall, 
