Rocks (Book)

This chapter discusses the rock cycle and each of the three major types of rocks that form on Earth. Separate sections cover igneous, sedimentary, and metamorphic rocks individually.

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- Chemical Sedimentary Rocks

Chemical sedimentary rocks form when crystals precipitate out from a liquid. The mineral halite, also called rock salt, forms this way. You can make halite! Leave a shallow dish of salt water out in the Sun. As the water evaporates, salt crystals form in the dish. There are other chemical sedimentary rocks, like gypsum.

Table below shows some common types of sedimentary rocks and the types of sediments that make them up.

Common Sedimentary Rocks
Picture Rock Name Type of Sedimentary Rock
Conglomerate Clastic
Breccia Clastic
Sandstone Clastic
Siltstone Clastic
Limestone Bioclastic
Coal Organic
Rock Salt Chemical precipitate