Physical classification of rocks

Physically rocks are classified as:

1. Stratified rock :

This shows distinct layers along which it can be easily split into thin slabs. Slate, sand stone and lime stone are its examples.

2. Unstratified rock :

This rock shows no sign of stratification and cannot be easily split into thin layers. Granite, basalt and trap are its examples.

All of sedimentary rocks are essentially stratified whereas all igneous rocks are unstratified. Metamorphic rocks may be either stratified or unstratified, depending upon the type of rock transformed.

Image Credit : Aaron McCoy