Explain the crystallization behavior of SiO2 system.

The crystallization behavior of the SiO2 (silicon dioxide) system is a fundamental aspect of petrology, particularly in the context of igneous and metamorphic processes. SiO2, commonly known as silica, is a key component of many rock-forming minerals and plays a crucial role in the Earth's crust. Understanding the crystallization behavior of the SiO2 system provides insights into the formation of various rock types and their mineral assemblages.

Silica exhibits polymorphism, meaning it can exist in different crystal structures under varying pressure and temperature conditions. The three main polymorphs of SiO2 relevant to petrology are quartz, tridymite, and cristobalite.

1. Quartz (α-Quartz):
   - Stable Conditions: Quartz is the most stable polymorph of SiO2 at surface conditions (low pressure and temperature). It crystallizes in the ____ ____ _______ ________ ______ ________ _______ ____ _________.
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