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What is the texture called when an igneous rock with large crystals scattered on a background of much smaller crystals?
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What is a rock with large crystals scattered on a background of much smaller crystals called?
If igneous, it is called a porphyry.
What kind of texture does a rock with large crystals scattered on a background of much smaller crystals have?
A porphyritic texture.
What is an extrusive igneous rock with a composition similar to granite but with smaller crystals?
Rhyolite.
What controls the grain size of igneous rock?
The rate at which the igneous rock cools controls grain size. Slower cooling results in larger crystals while faster cooling results in smaller crystals.
If Smaller crystals in igneous rock form when?
Smaller crystals form in igneous rocks if they are extrusive, meaning they formed at or near the Earth's surface. Because of the quick cooling of the magma/lava, there is no time for the crystal structure to expand, leaving it smaller than if it was an intrusive rock (forming inside the Earth, below the surface).
What is a rock with large crystals scattered on a background of much smaller crystals called?
If igneous, it is called a porphyry.
What kind of texture does a rock with large crystals scattered on a background of much smaller crystals have?
A porphyritic texture.
What is an igneous rock with crystals?
Granite with larger crystals, basalt with smaller crystals.
What is an extrusive igneous rock with a composition similar to granite but with smaller crystals?
Rhyolite.
What is an igneous rock with small crystals?
If you're not looking for anything specific, any extrusive igneous rock will have smaller crystals, if any at all. This is because they cool quickly on the surface, leaving little time for crystals to form/grow.
What controls the grain size of igneous rock?
The rate at which the igneous rock cools controls grain size. Slower cooling results in larger crystals while faster cooling results in smaller crystals.
If Smaller crystals in igneous rock form when?
Smaller crystals form in igneous rocks if they are extrusive, meaning they formed at or near the Earth's surface. Because of the quick cooling of the magma/lava, there is no time for the crystal structure to expand, leaving it smaller than if it was an intrusive rock (forming inside the Earth, below the surface).
How is the size of mineral crystals in igneous rock related to the rate at which they cool?
When igneous rocks cool quickly, they have small crystals and have a texture that may be described as aphanitic. When igneous rocks cool slowly, they have much larger crystals and have a texture that may be described as phaneritic or pegmatitic.
Does cooling rate affect solubility?
slower rates of cooling will create larger crystals, rapid cooling allows little time for element accumulation in the crystal, therefore, the crystals created will be smaller. larger, visible crystals in igneous rock indicate that the magma was slow cooling, usually at depth. much smaller crystals in igneous rock indicate rapid cooling of lava, usually at or near the surface. crystals in igneous rock will grow larger and have more to accumulate material for their growth the more they have at their crystallization temperature.
What does crystal size mean?
In igneous rocks, large crystals mean that the rock cooled more slowly. Smaller crystals mean that the rock cooled more quickly.
What is an igneous rock with both large and small crystals?
The type of igneous rock that has large crystals surrounded by smaller crystals is not a rock but a porphyritic texture. This texture describes igneous rock that has porphyrites, or large crystals, with surrounding tiny particles, or groundmass.
What are two types of igneous rock?
Two types of igneous rock are intrusive (also called plutonic) and extrusive. There is also porphyry rock which is partly intrusive and partly extrusive. Porphyry rock has large crystals embedded in a mass of much smaller crystals. The large crystals formed underground as does intrusive rock, and were carried in lava when it erupted. The mass of smaller crystals formed around the large crystals when the lava cooled quickly above ground, as does extrusive rock.
