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Why do plutonic rock and volcanic rock have big and small crystals respectively?
Wiki User
∙ 11y ago
The size of the crystals is a function of the rate of cooling of the molten rock. The faster the molten rock cools, the smaller the crystals will be.
Wiki User
∙ 11y ago
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Does pumice have large or small crystals?
Pumice does not have crystals. It is made of glass.
Does mudstone contain crystals?
Yes, however, those crystals are extremely small; some too small to be seen even by a microscope.
What are 2 basic classifications of Igneous rock?
The two types of igneous rock are are intrusive and extrusive, depending on where they form. Intrusive igneous rock forms underground from slow cooling magma. Extrusive igneous rock forms at or near the surface from quick cooling lava.
Do extrusive rocks cool quickly?
Extrusive rocks do cool quickly because either the crystals in the rock are very small or there are no crystals at all.
If a rock has many small holes what is it?
It is possibly a volcanic rock, for example scoria
Difference between volcanic and plutonic rocks?
Plutonic rocks solidify and crystallize beneath the Earth's surface. They are composed of large crystals. Volcanic rocks solidify and crystallize on the Earth's surface or under the sea. They are made up of very small crystals.
Why do plastic rock and volcanic rock have big and small crystals respectively?
Plutonic rock tends to have large crystals because it solidifies deep underground, where the overlying material insulates it so that it cools slowly, allowing time for large crystals to form. Volcanic rock tends to have small crystals (or to be amorphous) because it solidifies above ground, where air and water can cool it quickly by convection. Rapid cooling does not allow time for crystals to grow large. Plastic rock I don't know about.
Is shale a volcanic rock with small crystals made when lava cools?
No. Shale is a sedimentary rock formed from mud.
Can lava make glass?
Volcanic glass forms when molten material cools too quickly for crystals to form. The small size of volcanic ash particles ensures that the cool quickly.
What igneous rock cooled the most rapidly?
Igneous rocks with very small or no visible crystals are formed by rapid cooling. A good example would be obsidian (which is a volcanic glass) and BAsalt which may have an aphanitic texture (crystals to small to see with the naked eye).
What are small crystals called?
Small crystals. :D
How to seperate diamonds and sand?
Place the crushed rock and gem material into rotating drums filled with water. The water will disintegrate the small bits of volcanic material, leaving only diamond crystals intact. Add ferro-silicon sand to the mixture of water and ore to further separate the diamond crystals from the volcanic material.
Is pumice a metamorphic rock?
No pumice is not a porphyritic igneous rock, a porphyritic rock is characterized by the presence of phenocrysts (large mineral grains) and very small mineral grains with none in between. This implies that there was two different stages of cooling. Pumice is an extrusive igneous rock that cooled very quickly.
What is a black intrusive rock with small crystals?
Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals. A black extrusive igneous rock with small crystals could be basalt.
Andesite has small crystals because?
Andesite has small crystals because it cools quickly.
Name some rocks which have crystals?
All rocks have crystals, or at least crystalline structures. Sedimentary rocks may not have crystals as such, but the individual grains have internal crystal structures. All magmatic and metamorphic rocks have crystals, though they may be too small to be seen without the aid of a microscope. Only possible exception is Obsidian (volcanic glass) which may be amorphous.
Do igneous rocks have small crystals large crystals or no crystals?
It depends on the type of igneous rock. Intrusive igneous rocks such as granite have large crystals, extrusive igneous rocks may have small crystals as in basalt or no crystals as in pumice.
