CLASSIFICATION OF ROCKS

DEFINITION OF ROCK:-  A rock is solid mass or aggregate of minerals matter.

CLASSIFICATION OF ROCKS:-

I. Geological Classification →  

  1.Igneous Rock:- Rocks are formed by cooling and solidification of magma & lava.

• Plutonic(Intrusive)
• Volcanic(Extrusive)

Example:- Granite,Dolomite,Basalt,Trap,Pegmatite 

 2.Sedimentary rock:-Formed by weathering action of existing rock or by decomposition of soil particles.

• Clastic(Mechanical)
• Chemical
• Organic

Example:-Gravel,Sand Stone,Lime Stone,Shale,Gypsum,Lignite.

3.Meta-Morphic rock:-Both Igneous and Sedimentary rock goes under high pressure and temperature and formed Meta-Morphic rock.

Example:-Marble(Made from Limestone),Slate(Made from Granite),Quartz(Made from Sandstone),Laterite(Made from Basalt).

II.Physical Classification→  

1.Stratified Rock:-Rock showed layered Structure.

Example:-Sand Stone,Lime stone,Slate.

2.Unstratified Rock:-It's a complicated structure which is cannot easily split into thin slab.

Example:-Granite,Trap,Marble.

III.Chemical Classification→

1.Calcareous Rock:- Calcium carbonate is predominated in this type of rocks.

Example:- Marble,Limestone.

2.Argillaceous Rock:- Clay and Alumina is the main content of these rocks.

Example:-Slate,Mudstone,Laterite  

3.Silicious Rock:- silica is their main component.

Example:-Sand stone,Trap,Quartz,Granite.