Which one of the following sedimentary rocks has not been formed

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Which one of the following sedimentary rocks has not been formed mechanically?

Sandstone
Conglomerate
Loess
Geyserites
This question was previously asked in
UPSC CDS-2 – 2022
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Geyserites, also known as siliceous sinter, are deposits formed by the precipitation of silica from hot springs and geysers. This is a chemical process, not a mechanical one.
Sedimentary rocks are classified based on their formation process. Mechanically formed (clastic) sedimentary rocks are composed of fragments of pre-existing rocks and minerals transported and deposited by agents like water, wind, or ice.
Sandstone is a clastic sedimentary rock formed from sand-sized grains. Conglomerate is a clastic sedimentary rock composed of rounded pebbles and cobbles. Loess is a clastic sediment composed of wind-blown silt-sized particles. These are all formed through mechanical processes of weathering, erosion, transport, and deposition of clastic material.

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