1.Introduction

2. Zeolites: what are they?

2.1.Zeolitic memories

2.2. The concept

2.3. Zeolite LEGO: Structure and taxonomy of zeolites

2.4. Natural and Synthetic zeolites

3. Zeolite Synthesis - General Aspects

3.1. Synthesis Methods

3.2. Physical Chemistry of Zeolite Crystallization

3.3. Mechanisms of zeolite formation

3.4. Influence of synthesis parameters

3.4.1. Temperature

3.4.2. Ageing

3.4.3. Pressure

3.4.4. Stirring or Static

3.4.5. Chemistry composition of the system

3.4.6. Basicity and Acidity of the Synthesis medium

3.4.7. Sources of the components

3.4.8. Time

4. Zeolite Eco-friendly Synthesis

4.1. Coal Ash raw materials

4.2. Rusk Rice Ash raw materials

4.3. Clays raw materials

4.3. Raw powder glass materials

4.4. Industrial wastes as raw materials

4.5. Other raw materials

5. Conclusions - future approaches

6. References