A sedimentary rock that consists of one or more minerals formed as precipitates from the evaporation of a saline solution, such as saltwater. Usually, the first evaporite to form from saltwater is calcium, followed by gypsum and then halite.
Simply so, where are evaporites formed?
Rocks formed by the evaporation of water are called evaporites - gypsum, anhydrite, halite (common salt). This evaporation may occur in either shallow basins on land or in the sea. Material (salts) is eroded from land surfaces and is then carried to the sea by rivers.
Where are most sedimentary rocks formed?
Sedimentary rocks form when mud and sand are deposited in layers on the Earth's surface. The layers are deposited in many environments including oceans, rivers and deserts. These layers of sand and mud are later buried. The weight of overlying layers compresses the mud and sand to form solid rock.
Is limestone an evaporite?
Dolomite often forms when limestone recrystallizes after burial. Many limestones are biochemical; some may be chemical (inorganically precipitated). Evaporite rocks form when sea water or lake water dries up and precipitates gypsum (CaSO. Evaporites are chemical sedimentary rocks.