552 
21 
29 
23 
24 
25 
26 
27 
28 
20 
3 
31 
22 
33 
34 
35 
6 
7 
+ 
30 
4 
41 
42 
43 
AA 
45 
46 
7 
aR 
40 
3 
I 
[ake] 
23 
84 
55 
56 
.57 
58 
59 
.6 
7 
DECIMAL CLASSIFICATION 
Lithology  Petrografy Petrology 
Igneous rocks 
Volcanic rocks 
Lavas Scoria 
Volcanic ashes Volcanic tufa 
Obsidian Pumis Pitchstone 
Trachyte 
Rhyolite 
Andesite 
Felsites 
Basalt 
Other volcanic rocks 
lutonic rocks 
Porphyry Porphyrite 
Syenite 
Granit 
Diabase and gabbro 
Dolerite 
Diorite 
Norite 
Peridotite 
Other Plutonic rocks 
Metamorfic rocks 
Granits and syenites 
Gneiss 
Schists 
Slates Argillite Phyllite 
Quartzite Novaculite Itacolumite 
Marble Crystallin limestone 
Serpentine 
Chrysolitic rocks 
Other metamorfic rocks 
Sedimentary rocks 
Sandstone Conglomerate Sand Gravel 
Shale Clay Silt 
Gypsum Salt 
Limestone Marl Ooze 
Dolomite 
Oolite 
Infusorial or diatomaceous earth 
Glauconite Greensand 
Other sedimentary rocks 
Meteorites 
Decay of rocks