True. Veins minerals are deposited from solutions like water that flow through cracks in rocks, carrying dissolved minerals which crystallize and form veins as the solution evaporates or cools.
Chemical Rock
A hydrothermal solution is a very hot mixture of water and dissolved substances. Hydrothermal solutions have temperatures between 1000C and 3000C. When these solutions come into contact with existing materials, chemical reactions occur to form new materials. Also, when such solutions cool, some of the elements in them combine to form such minerals as quarts and pyrite.
A Chemical Rock
Non-Clastic, or chemical, sedimentary rock is formed from dissolved minerals. These rocks are made of chemical sediments that have been dissolved from minerals. Solid minerals precipitate out of the solution in water. These minerals layer, and the water above them causes the pressure which forms the rock.
Deep in the Earth, minerals are dissolved in the hot, high pressure water underground. That water seeps upwards into cracks in the rock. As it rises, it both cools and lowers in pressure. These reduce the ability of the water to hold the minerals in solution. The minerals crystallize in the cracks, forming the veins of mineral ore.
The hot water solution cools, and the mineral compound leaves and forms minerals.
This is one method of crystal formation.
Chemical sedimentary rocks, such as limestone and chert, can form when minerals crystallize from seawater. These rocks are typically composed of minerals that precipitate out of solution in bodies of water, including oceans.
The hot water solution cools, and the mineral compound leaves and forms minerals.
The hot water solution cools, and the mineral compound leaves and forms minerals.
The Bowen's Reaction Series lists the order of crystallization of minerals from high temperature to low temperature environments, starting with olivine and ending with quartz. See the link below.