PURE SCIENCE 
552.8 Microscopic petrografy 
81 Determination of rock mincrals 
82 Rock structure 
553 
II 
12 
13 
14 
I5 
16 
17 
18 
.I0 
2 
nT 
nn. 
23 
24 
25 
26 
2% 
28 
20 
3 
4 
41 
42 
43 
44 
45 
46 
47 
48 
49 
5 
SI 
“2 
53 
54 
55 
56 
37 
58 
RQ 
Economic geology See also 622 Mining engineering 
Ore deposits 
Formation and structure 
Classification 
Superficial: placers 
Stratified: beds, etc. 
Unstratified 
Disseminated thru eruptiv rocks 
Stockwerks Fahlbands Contacts 
Chambers and pockets Impregnations 
Mineral veins 
Carbon series 
Peat 
Lignite and jet 
Cannel coal Bituminous shale 
Bituminous and semibituminous coals 
Anthracite and grafitic anthracite 
Grafite Plumbago 
Asfalt and asfaltic coals Ozocerite 
Petroleum Natural gas 
Fossil gums and resins 
Ores of iron 
Ores of metals other than iron 
Ores of gold 
Ores of silver 
Ores of copper 
Ores of led 
Ores of zinc and tin Mercury 
Ores of manganese and chromium 
Ores of antimony and arsenic 
Ores of nickel and cobalt 
Other metallic ores 
Bilding stones 
Marbles and limestones 
Granits and syenites 
Sandstones 
Slates 
Serpentines Soapstones 
Porphyries 
Trap 
Tufa Peperino 
Other bildinge stones 
While the history of all 
other products goes in 553, 
history of metals is more 
useful in 669, Metallurgy