minerals form
minerals form
granitite magma is a course -grained igneous rock.
Both are formed from the crystallization of minerals caused by the cooling of magma.Intrusive igneous rocks cooled below the surface of the planet, however, and generally display larger crystals due to the increased amount of time spent at mineral crystallization temperatures from the insulating effect of surrounding material.Examples: granite, gabbro, diorite, peridotite.Extrusive rocks are formed from magma at or above the surface of the planet, and generally display smaller mineral crystals, or no crystals at all, because of the rapid cooling environment in which they form. Chemically, an intrusive and extrusive rock could be identical, the only difference being the size of the mineral crystals they contain.Examples: obsidian, rhyolite, pumice, scoria, basalt.
A porphyritic igneous rock is one with a texture containing large isolated crystals (phenocrysts) in a mass of fine grained crystals . Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.
Igneous rocks are one of the 3 main type of rocks, the others being sedimentary and metamorphic rocks. Igneous rocks are formed from the cooling of lava and magma. There are over 700 kinds of igneous rocks, and most are found beneath the surface of the Earth's crust.
minerals form
crystallization above ground and crystallization below ground
Extrusive igneous rock is formed from the solidification of lava.Intrusive igneous rock is formed from the solidification of magma.
granitite magma is a course -grained igneous rock.
Magma moves under the lithosphere because the aesthenosphere (and magma) are ductile - they act as a fluid, although a very viscous one, and they do flow. The viscosity of a magma depends on its mineral composition. Magma will move in convection currents throughout the aesthenosphere due to the heating and cooling of it as it travels throughout the aesthenosphere.
Igneous is one of the three major rock classifications in geology. An igneous rock is a rock formed from the cooling and solidification of magma or lava.
It is called an igneous rock.Igneous rock is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.
there are many parts of a volcano. There is the magma chamber: where all of the magma is held. There is the pipe: where the magma comes up and through the volcano. There is the dike, where where a slab forms when magma forces itself across rock layers. There is the crater, where a bowl shaped area forms around a volcanoes central vent. There is the vent: where magms comes out.
Both are formed from the crystallization of minerals caused by the cooling of magma.Intrusive igneous rocks cooled below the surface of the planet, however, and generally display larger crystals due to the increased amount of time spent at mineral crystallization temperatures from the insulating effect of surrounding material.Examples: granite, gabbro, diorite, peridotite.Extrusive rocks are formed from magma at or above the surface of the planet, and generally display smaller mineral crystals, or no crystals at all, because of the rapid cooling environment in which they form. Chemically, an intrusive and extrusive rock could be identical, the only difference being the size of the mineral crystals they contain.Examples: obsidian, rhyolite, pumice, scoria, basalt.
The theory of plate tectonics.
All Igneous rocks are crystalline, but also note that Metamorphic rocks are also often crystalline, at least to a certain extent. Both of these categories always contain some crystals.
The rate of cooling is the main factor that affects the size of crystals that form as magma cools. Slower cooling allows for larger crystals to develop, while rapid cooling results in smaller crystals or even glassy textures. Other factors such as mineral composition and presence of impurities can also influence crystal size.