What Is Extrusive Granite

The central cores of major mountain ranges consist of intrusive igneous rocks usually granite.

What is extrusive granite.

Granite is extrusive because its made of magma is granite an extrusive igneous rock. Basalt is an extrusive or intrusive rock that makes up most of the world s oceanic crust. It contains more than 68 weight of silica in composition and is granular and coarse grained in texture. Its principal minerals are feldspars quartz and mica.

The question is granite intrusive or extrusive is therefore a common among many people. Granite is one of the most commonly found rocks on the surface of the earth. Extrusive or volcanic igneous rock is produced when magma exits and cools as lava at or near the earth s surface. Rocks that form from magma that has yet not come out of the volcano are termed as intrusive rocks.

This specimen erupted from kilauea volcano in 1960. By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust. Granite boulders at joshua tree national park california. Exposed to the relatively cool temperatures of the atmosphere the lava cools quickly meaning that mineral crystals don t have much time to grow.

Some cool so quickly that they form an amorphous glass. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock. Granite is a coarse grained light colored intrusive igneous rock that contains mainly quartz feldspar and mica minerals. The molten material then slowly solidifies below earth s surface where it may later be exposed through erosion.

Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. How is granite different from scoria pumice and obsidian. Granite is an intrusive igneous rock. The specimen above is about two inches five centimeters across.

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. It has a lot of excellent properties that make it an excellent tool for construction aggregation as well as learning purposes. Photo by eva didonato.

Extrusive rock any rock derived from magma molten silicate material that was poured out or ejected at earth s surface.