Colour coding:

 

 

Rock cycle index

The Rock cycle

Rock formation

Erosion and weathering

Identification of rocks

Grain

Cementation

Crystal structures of rocks

Sedimentary

Metamorphic

Gems

Ores

 

Gemstones - The most beautiful and impressive rocks

 

 

Emerald -

 

Ruby

Tourmaline

 

© Ricardo Esplugas. All images in this site can be bought in an enlarged version. Please contact me on ricardochemistry@gmail.com