INGENEOUS, SEDEMENTARY, AND METAMORPHIC ROCKS

Rocks are in order to make it easier on people to confirm them in the future. This can be done in a numerous ways. Each rock type has their own specific ways, but there are two different aspect that apply to all. The particular and composition. These two, before with some others help to classify igneous, sedimentary, and metamorphic rocks.
The First Group is Igneous rocks are historical first by construction. This is broken down mainly into grain size. First there are intrusive, or plutonic igneous rocks. These types of rocks cool within the crust and form large, visible crystals. The opposite would be extrusive, or volcanic rocks. “These rocks are characterized as either extrusive or intrusive”.
Types of Extrusive Rocks
Basalt is normally a dense, dark, massive rocks, high in calcium and iron magnesium- bearing minerals and low in quartz content.
Andesite is an extrusive rock intermediate in composition between rhyolite and basalt. Andesite lava is of moderate viscosity and forms thick lava flows and domes.
Rhyolite is a felsic extrusive rock. Due to the high silica content, rhyolite lava is very viscous. It flows slowly, like tooth paste squeezed out of a tube, and tends to pile up and form lava domes.
Intrusive igneous rocks are made from silica and plagioclase. They tend to be grays and browns in color. And then, felsic rocks are light in color and contains with some amphibole and biotitew.
Granite is an igneous rock composed mostly of two minerals: quartz and feldspar. It is an intrusive rock, meaning that it crystallized from magma that cooled far below the earth's surface.
Diorite is an intrusive rock intermediate in composition between gabbro and granite. It is produced in volcanic arcs, and in mountain building where it can occur in large volumes as batholiths in the roots of mountains.

The Second Group Sedimentary Rocks
Erosion and deposition play a key part in the formation of sedimentary rock. Some common sedimentary rocks are shale, sandstone, limestone, and conglomerate.
Shale is lithfied clay and consists of layers that typically break into thin sheets. A well known shale formation is the Wheeler Shale of the House Range, MIlard County, Which contains numerous Cambrian period five hundred to five hundred seventy years ago. These is visible along Utah State Highway, only Carbon and Emery Counties.
Sandstone is a sedimentary rock composed of sand-sized grains of mineral, rock or organic material.
Limestone is a sedimentary rock, which means it was formed from small particles of rock or stone that have been compacted by pressure. Sedimentary rock is important because it often contains fossils and gives clues about what type of rock was on the Earth long ago. Just like a tree's rings tell a lot about its environment, layers found in sedimentary rock can tell about important changes in the environment.
Conglomerate is a sedimentary rock formed from rounded gravel and boulder sized clasts cemented together in a pattern.
The Last Group Metamorphic Rocks
There are any rock type that has been altered by heat, pressure, and the chemical action of fluids and gases.
This rocks are classified by their structure and their dominat minerals. Metamorphic rock structure is either foliated or nonfoliated. Adequate separate metamorphic rocks are slate, phyllite, schist and gnesiss.
Foliated
Slate is fine grained, dense, and brittle and is a metamorphosed form a shale.
Schist has the same satin.like sheen as phyllite but has a coarse texture due to its high mica content.
Gneiss is a high grade metamorphic rock in which foliation results from a layering of different mineral groups, which give this rocks a banded look of dark and light minerals.

Nonfoliated
Quartzite is a metamorphic rock formed when quartz-rich sandstone or chert has been exposed to high temperatures and pressures.
However, igneous, sedimentary, and metamorphic rocks are the three groups that we can classify rocks, and each group has its own style process that makes it different from the other groups. In that event, each rock has its own looks, Ocurrence, and uses for humans. Igneous rocks are often used in construction operations. Sedimentary rocks contain valuable materials such as petrol, coal, and drinking water. Metamorphic rocks are used in decoration, and sometimes contain precious minerals like gold and copper. These types of rocks can found normally arround of Utah and this comment is based by Rebecca Hylland.