Which one of the following is an example of both an igneous as well as a metamorphic rock ?

Granite is primarily classified as an intrusive igneous rock, formed by the slow cooling and crystallization of magma beneath the Earth's surface. However, it is also frequently associated with metamorphic processes in geological studies.

• Granitization: This is a high-grade metamorphic process where solid rocks are transformed into granitic rocks through chemical replacement (metasomatism) without reaching a fully molten state.
• Anatexis: In extreme metamorphic environments, pre-existing rocks undergo partial melting to produce granitic magma. This makes granite a product of the terminal stage of metamorphism.

Due to these dual origins—either from primary mantle-derived magma or from the extreme transformation of crustal rocks—granite is considered an example that bridges the igneous and metamorphic categories. In contrast, Gabbro is strictly igneous, and Geyserite is a form of sedimentary silica.