Discuss the classification of rock forming minerals giving suitable examples.

Rock-forming minerals are the essential minerals that constitute the majority of Earth's crust and are classified based on their chemical composition and crystal structure. These minerals are broadly categorized into silicates and non-silicates.

### 1. Silicate Minerals  
Silicates are the most abundant group of minerals, making up approximately 90% of the Earth's crust. They are primarily composed of silicon (Si) and oxygen (O), forming the basic silicate tetrahedron (SiO₄)⁴⁻, which can link in various ways to create diverse mineral structures.

#### a. Nesosilicates (Isolated Tetrahedra)
Each tetrahedron is independent and bonded by metallic cations.  
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