Rocks are aggregates of one or more types of minerals while minerals are the result of natural physical-chemical processes of a certain chemical composition and a crystal structure stable at certain temperature and pressure conditions. Proper inner mineral structure is also reflected in their external shape. Such proper shapes are called crystals. 

Minerals (more than 4,700 are known today) are divided into 14 classes according to their chemical composition and structural characteristics; Native Elements, Sulphides, Sulphates, Halides, Oxides and Hydroxides, Carbonates, Nitrates, Borates, Iodates, Sulphides, Phosphates, Arsenates and Vanadates, Wolframites and Molybdates, Organic Compounds and a large group of Silicates that make up 95% of the Earth’s crust.

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