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texture
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The crystal the size of an igneous rock is described as its what?
texture
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.
Does igneous rock texture refers to size?
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What size of rock texture refers to igneous rock?
The size of the mineral crystals in an igneous rock determines the rock's texture.
What happens to the size of a crystal when the rate of a cooling igneous rock increases?
When the rate of cooling of an igneous rock increases, the crystal size tends to decrease. This is because faster cooling results in less time for crystals to grow, leading to smaller crystals. Conversely, slower cooling allows crystals more time to grow, resulting in larger crystal sizes.
What do extrusive igneous rocks look like?
The particle size (grain size--crystal size) in igneous rock is largely dependent on the amount of time spent cooling and solidifying from molten rock. If cooled quickly, crystals will have little time to grow. Slow cooling allows time for larger crystal growth.
What size is an intrusive Igneous Rock?
Intrusive igneous rocks can vary in size from small dikes and sills to large batholiths. Dikes and sills are typically on the smaller end of the size spectrum, ranging from a few centimeters to several meters in width. Batholiths, on the other hand, can cover hundreds to thousands of square kilometers.
What determines how large the crystals in an igneous rock will be?
The cooling rate of magma determines the size of crystals in an igneous rock. Slow cooling allows larger crystals to form, while rapid cooling results in smaller crystals or a glassy texture. Other factors such as mineral composition and amount of available space for crystal growth also influence crystal size.
What is the grain size of a fine grained igneous rock?
The individual grains (crystals) in quickly cooled magma are described as aphanitic--not visible without magnification.
What is the crystal size for extrusive igneous rocks?
Fine grained
Why is pegmatite igneous?
Pegmatite is classified as an igneous rock because it forms from the cooling and solidification of molten material, typically within the Earth's crust. Pegmatite is characterized by its large crystal size, which indicates that it cooled slowly, allowing the minerals to grow to a significant size.
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.
