Different types of rock consist of various minerals. For example, granite consists of three minerals: quartz, feldspar and mica.

Types of rock can be classified into three distinct groups, depending on how they have been formed:

• Ingeous rock types have formed when molten volcanic rock or magma has cooled down over time.
• Sedimentary rock types have formed from layered and sedimented materials. 
• Metamorphic rock types have formed as other rock types have been altered by various processess over time.

The Finnish bedrock is rich in ingenious and metamorphic rock types.