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SECTION IV.— MINERALS. 
Bub-Section I. — Minerals which are either the components of 
ROCKS OR ARE FOUND EMBEDDED IN THEM. 
1 Rock Crystal, a large crystal of the kind used 
for the manufacture of spectacle lenses. Brazil. 
2 Do. with copper and iron pyrites. Cornwall. 
3 Do. . massive and shewing the fracture. Brazil. 
4 Common Quartz with some crystals of calcite. Cornwall. 
5 Do. some of the crystals doubly terminated. Do. 
G Do. in detached doubly terminated 
crystals. Buxton, Derbyshire. 
7 Do. with acicular crystals of gbthite 
lining the interior of a quartz geode, commonly 
called a potato-stone. Near Bristol. 
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8 Rose Quartz. Rabensteiu, Bavaria. 
9 Pale Amethystine Quartz on onyx-agate. Faroe Islands. 
10 Amethyst on common quartz. Schemnitz, Hungary. 
11 Do. massive and exhibiting the fracture. Brazil. 
12 Citrine or Yellow Quartz. Do. 
13 Cairngorm or Smoky Quartz, massive. Scotland. 
14 Do. in crystals enclosing acicular gbthite, 
on eisenkiesel. Near Bristol. 
15 Quartz Sand, used in the manufacture 
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of glass. Alum Bay, Isle of Wight. 
10 Cat’s- Eye, polished. Ceylon. 
17 Flint lined with crystals of quartz. Kent. 
18 Chert (ferruginous), with casts of shells, from the 
Devonian formation, near Barnstaple, Devonshire. 
19 Chert, banded, with some drusy quartz. 
20 Rock Crystal in doubly terminated crystals. 
Herkimer Co., New York, U, S. A, 
