Discuss the classification of rock forming minerals giving suitable examples.

Rock-forming minerals are the essential building blocks of rocks and are classified based on their chemical composition, crystal structure, and physical properties. In the fields of crystallography, mineralogy, and economic geology, understanding the classification of these minerals helps in identifying rock types, their formation conditions, and their economic value.

In crystallography, minerals are classified according to their crystal systems and symmetry. There are seven crystal systems: cubic, tetragonal, hexagonal, trigonal, orthorhombic, monoclinic, and triclinic. For example, quartz belongs to the hexagonal system, while feldspar belongs to the triclinic or monoclinic systems depending on the type. The crystal structure influences the physical properties of the minerals, such as cleavage, fracture, and hardness, which are critical for mineral identification.

From a mineralogical perspective, rock-forming minerals are mainly divided into silicates and non-silicates. Silicate minerals contain silicon and oxygen as their primary building blocks, often _________ ______ ___ _______ _________ ________.
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