Quartz is the most important mineral in clastic sedimentary rocks.

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Quartz is the most common mineral found in clastic sedimentary rocks. It is a hard, durable mineral that is resistant to weathering and erosion, so it tends to persist long after other minerals have been broken down and washed away. As a result, it is often the dominant mineral in sandstones, conglomerates, and other clastic rocks that are composed of sand, gravel, and other sedimentary particles.

Quartz Is the Most Important Mineral in Clastic Sedimentary Rocks