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Q: What is the crystal size for extrusive igneous rocks?
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What refers to the size of the crystals evident in the rock and is the property you use to classify igneous rocks is?

intrusive and extrusive


What is the name of igneous rocks that have large crystals and small crystals?

Large Crystals = Intrusive Small Crystals = Extrusive The name relates to where the minerals were cooled (at at what rate). In the case of intrusive igneous, the rocks were formed above Earth's surface and were thus cooled quickly and the minerals had little time to become defined. Extrusive rocks, therefore, were formed within the Earth's mantle and had a much longer time before being gathered to cool (as they slowly rose to the top).


How do you classify igneous rocks?

Look at them. There shape, size, color and feel! Dont worry you will figure it out....


What is the difference between crystal size in intrusive and extrusive igneous rocks?

All rocks are different. Some of those could be the same. It all depends on how fast they harden. Obsidian, for an example, hardens super fast, because it is usually exposed to water and that can take anything from a few minutes to a few days. And granite, for another example hardens deep in the earth, and that takes up to millions on years, so the crystals have more time to grow.


What type of rock is formed when an igneous rock is cooled very rapidly?

When magma is cooled, it forms an igneous rock. When magma is cooled rapidly, that igneous rock is of the category called "extrusive" or "volcanic". When the magma is cooled very rapidly, the extrusive igneous rock formed will probably be holohyaline (glassy) in texture, or foamy like pumice.However if you take an igneous rock that is already rock and cool that very rapidly it will probably shatter owing to thermal stress. That might result in the formation of tuff.

Related questions

Which crystal can help identify as igneous rock as intrusive or extrusive?

What is the effect of location on crystal size? Label the location of intrusive and extrusive igneous rocks on the diagram below. Then, illustrate the crystal size of the rock formed at that location in the appropriate callout circles.


Igneous rock are classified based upon their?

There are two types of igneous rocks; intrusive and extrusive. Intrusive igneous rocks are formed underneath the earth's surface from magma where it cools slower and develops large crystal structures. Extrusive igneous rocks are formed above the earth's surface from lava that cools quickly and creates rocks with smaller, finer crystal structures.


How does the rate of cooling influence crystal size of igneous rocks and how does that help you to distinguish between intrusive and extrusive igneous rocks?

The longer that magma is able to cool, the larger the crystals will be. Intrusive rocks will have larger crystals than extrusive rocks. For example granite (intrusive) has larger grains than rhyolite (extrusive).


How can you determine if a igneous rock has had an intrusive or extrusive origin?

== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.


What is the grain size of an extrusive igneous?

It depend what rock it is but extrusive rocks generally non-crystalline or have a grain size of less than 1 mm


What would not be used to classify igneous rocks?

crystal size


What refers to the size of the crystals evident in the rock and is the property you use to classify igneous rocks is?

intrusive and extrusive


What is a factor that controls grain size in igneos rocks?

Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.


The formation of igneous rocks is powered by?

the cooling and solidification of molten magma or lava. This process occurs either underneath the Earth's surface, resulting in intrusive igneous rocks, or on the surface, leading to extrusive igneous rocks. The rate of cooling determines the texture and crystal size of the rock, with slower cooling allowing for larger crystals to form.


What is the name of igneous rocks that have large crystals and small crystals?

Large Crystals = Intrusive Small Crystals = Extrusive The name relates to where the minerals were cooled (at at what rate). In the case of intrusive igneous, the rocks were formed above Earth's surface and were thus cooled quickly and the minerals had little time to become defined. Extrusive rocks, therefore, were formed within the Earth's mantle and had a much longer time before being gathered to cool (as they slowly rose to the top).


What is the crystal size in a extrusive rock?

the size of crystals in extrusive roks


Is conglomerate intrusive or extrusive?

Neither. Conglomerate is a sedimentary rock. Intrusive and extrusive are descriptive terms used to classify igneous rocks.