Geology and Soil Mechanics FORMATION PROCESSES Rocks can be grouped into three broad classes, depending on their origin. They are-• • •
Igneous. Sedimentary. Metamorphic
CLASSIFICATION OF ROCKS Rocks can be grouped into three broad classes, depending on their origin. They are-• • •
Igneous. (Origin from magma/lavas) Sedimentary. (Weathering/erosion of other rocks) Metamorphic (pressure and heating of rocks)
Classified on TEXTURE/ FABRIC
GRANULAR GRAIN SIZE
ARRANGEMENT CRYSTALLINE
LIGHT
COMPOSITION
MINERAL CONTENT
COLOUR DARK