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An igneous rock that has two or more different sized crystals because its cooling rate has changed is called an?
Wiki User
∙ 12y ago
Sounds like you're studying rocks in science too!
It's called porphyry. Glad to help a fellow student out ;)
Wiki User
∙ 12y ago
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Why does slower cooling result in purer crytsalS?
Slower cooling allows the atoms time to arrange in a crystalline form, whereas faster cooling freezes the atoms in position before they can all arrange themselves in the crystalline structure.
Explain pegmatite is coarse grained with large crystals basalt is fine grained with small crystals and obsidian has no crystals?
Crystal size in these rock types is determined by their rate of cooling. Pegmatites have large crystals due to very slow cooling. Obsidian has microscopic crystals due to almost instantaneous cooling.
What type of crystals form in intrusive rocks?
large,well developed crystals.This is because of slow cooling process
Does slower cooling result in bigger cystals?
Does slower cooling result in bigger crystals
What rate of cooling produces the largest crystals in igneous rocks?
A slow rate of cooling. The slower a magma cools, the longer the crystals have to grow, thus the bigger they will be.
Size of crystals made by slow cooling?
because the crystals gradually start to melt.
How are crystals formed and how does the rate effect the crystal?
Crystals that are formed below the surface are formed by the cooling of magma. Crystals above the surface are formed when a volcano erupts, and cools, again, above the surface. Crystals that are below the surface usually have a slower rate of cooling than those above the surface, causing bigger crystals because of the slower cooling:)
How will cooling affect maple syrup crystal size?
Fast cooling=small crystals Slow cooling=big crystals
Why do you think that quick cooling makes small crystals form?
I think (and know) it is because there is less time for crystals to grow.
Why does slower cooling result in purer crytsalS?
Slower cooling allows the atoms time to arrange in a crystalline form, whereas faster cooling freezes the atoms in position before they can all arrange themselves in the crystalline structure.
How does the speed of cooling of molten rock affect the size of crystals that form?
fast cooling rate forms smaller crystals eg Andesiteslow cooling rate forms large crystals eg.Pegmatite
Does slow cooling of igneous rocks form large or small crystal grains?
Slow cooling of igneous rocks typically forms large crystal grains. This is because slow cooling allows more time for mineral grains to grow, resulting in larger crystals. Examples of rocks formed through slow cooling and having large crystal grains include granite and gabbro.
Explain pegmatite is coarse grained with large crystals basalt is fine grained with small crystals and obsidian has no crystals?
Crystal size in these rock types is determined by their rate of cooling. Pegmatites have large crystals due to very slow cooling. Obsidian has microscopic crystals due to almost instantaneous cooling.
Does steel have a crystalline structure?
Yes steel can have multiple types of crystalline structure or "grain" structure. These structures can be changed by heating and cooling the steel in particular ways. This is not unlike how different temperatures and cooling speeds cause water to form different sizes and shapes of ice crystals, which can be readily observed in snow crystals. In steel, the properties of the alloy will be determined in large part by the crystal structure, like hardness, ductility, tensile strength. The manipulation of these crystalline structure through controlled heating and cooling is known as tempering, or heat treating.
What does grain size tell you about the orgin and cooling time of an igneous rock?
The larger the crystals, the more time it had to cool because the crystals had more time to grow
What determines crystal size in an igneous rock?
It depends on the cooling of lava. Slow cooling forms big crystals deep under the surface while fast cooling creates small crystals on or just below the earths surface. Itstant cooling wouls have no crystals.
Slow cooling of hot magma lead to the formation of what crystals?
large crystals
