Bowen's Reaction Series explains why Si-rich minerals are the last to crystallize from a magma.

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Bowen's Reaction Series describes the order in which minerals crystallize from a cooling magma, with SiO2-rich minerals forming last. This is because SiO2 has a high melting point and is more resistant to crystallization than other minerals in the magma. As the magma cools and more and more minerals crystallize out, the remaining liquid becomes enriched in SiO2, causing Si-rich minerals to form last.

Bowen's Reaction Series Explains Why Si-Rich Minerals Are the Last