GS PrelimsGeography (Physical)Mineral and Rocks2001

Quartzite is metamorphosed from

Limestone

Obsidian

Sandstone

Shale

Correct Answer: Option C

Explanation

1. Metamorphic rocks are formed when existing rocks (protoliths) are transformed by heat, pressure, or chemical reactions. 2. Quartzite is a hard, non-foliated metamorphic rock. 3. Its protolith (the original rock from which it metamorphosed) is quartz-rich Sandstone. 4. During metamorphism, the quartz grains in the sandstone recrystallize, fusing together to form a dense, interlocking mosaic of quartz crystals. 5. Limestone metamorphoses into marble. Obsidian is an igneous rock (volcanic glass). Shale metamorphoses into slate, phyllite, schist, or gneiss depending on the degree of metamorphism.

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