What Is Extrusive Granite

Photo by eva didonato.

What is extrusive granite.

Granite is a coarse grained light colored intrusive igneous rock that contains mainly quartz feldspar and mica minerals. Rocks that form from magma that has yet not come out of the volcano are termed as intrusive rocks. Basalt is an extrusive or intrusive rock that makes up most of the world s oceanic crust. Granite is an intrusive igneous rock.

It has a lot of excellent properties that make it an excellent tool for construction aggregation as well as learning purposes. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. The question is granite intrusive or extrusive is therefore a common among many people. Extrusive rock any rock derived from magma molten silicate material that was poured out or ejected at earth s surface.

How is granite different from scoria pumice and obsidian. The central cores of major mountain ranges consist of intrusive igneous rocks usually granite. Cooling of intrusive rocks takes much longer than extrusive rocks as they are under the surface of the earth. The molten material then slowly solidifies below earth s surface where it may later be exposed through erosion.

This specimen erupted from kilauea volcano in 1960. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock. Br br as a result you won t be able to see them as individual. Granite is one of the most commonly found rocks on the surface of the earth.

Basalt is fine grained so the individual minerals are not visible but they include pyroxene plagioclase feldspar and olivine these minerals are visible in the coarse grained plutonic version of basalt called gabbro. Granite is an intrusive ingenuous rock. Extrusive or volcanic igneous rock is produced when magma exits and cools as lava at or near the earth s surface. The specimen above is about two inches five centimeters across.

It contains more than 68 weight of silica in composition and is granular and coarse grained in texture. Some cool so quickly that they form an amorphous glass. Exposed to the relatively cool temperatures of the atmosphere the lava cools quickly meaning that mineral crystals don t have much time to grow. By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust.

Its principal minerals are feldspars quartz and mica.