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These are igneous rocks that are too fine textured to an extent that there mineral grains or crystalline texture cannot be seen or distinguished with the necked or unaided eyes. They appear or occur as a whole single massive crystalline extrusive body of Igneous origin. Example is Obsidian.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoAphanite or aphanitic igneous rocks are those with mineral crystals that are too small to see without magnification. Many igneous rocks could be labeled as aphanitic, such as basalt and rhyolite.
Wiki User
∙ 14y agoNo. Apatite is a mineral which may be a part of a formed rock, but is not considered a rock by itself.
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How are basalt and granite different in their Orgin texture and mineral composition and how are they similar?
Both rocks are igneous rock but basalt is an aphanitic igneous rock while granite is a common type of felsic intrusive igneous rock.
What is the origin of rhyolite?
Rhyolite forms when the felsic magma (greater than 63% SiO2 by weight) came out to the earth surface and can be identified by its aphanitic texture ( The individual crystals in an aphanitic igneous rock are not distinguisable to the naked eye)
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.
Igneous rocks are classified based upon their mineral composition and?
And their texture, which can be aphanitic, phaneritic, glassy, or porphyritic. mineral composition and crystal texture
What is an igneous rock with small crystals called?
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What kind of texture will an igneous rock have if it cooled very quickly and you can not see crystals?
The texture thus described is referred to as aphanitic texture.
What is Andesite texture?
Andesite texture is fine-grained and Extrusive plus it a type of igneous rock.
What is igneous rock with small crystals called?
The rock is said to be extrusive or possess an aphanitic texture, as a result of relatively rapid cooling.
How are basalt and granite different in their Orgin texture and mineral composition and how are they similar?
Both rocks are igneous rock but basalt is an aphanitic igneous rock while granite is a common type of felsic intrusive igneous rock.
Which igneous rocks exhibit aphanitic texure?
Normally, extrusive igneous rocks exhibit an aphanitic texture. Examples would be basalt and rhyolite.
What is the term given to igneous rocks with crystals too small to see without a hand lens?
These are extrusive igneous rocks with an aphanitic texture.
What is the origin of rhyolite?
Rhyolite forms when the felsic magma (greater than 63% SiO2 by weight) came out to the earth surface and can be identified by its aphanitic texture ( The individual crystals in an aphanitic igneous rock are not distinguisable to the naked eye)
If there are small crystals in a rock what is it called?
The rock is said to have a fine-grained texture, also referred to as an aphanitic texture.
Type of crystal grain that form when molten rock cools quickly?
Small crystal grains form when molten rock cools quickly. In an extrusive igneous rock, it's referred to as aphanitic texture.
Is diorite's texture a aphanitic?
Yes diorite's texture is aphanitic.
What size of rock texture refers to igneous rock?
The size of the mineral crystals in an igneous rock determines the rock's texture.
How is the texture of an igneous rock used to identify the conditions under which the rock formed?
The three main categories of igneous rock texture are aphanitic, phaneritic, and porphyritic. Aphanitic texture is described as a crystalline igneous structure that is too small to be seen with the naked eye. This texture indicates that the rock was cooled at or near the surface, quickly, with little time for crystal growth. Phaneritic texture is described as a rock with a visible crystalline structure, indicating that the rock was cooled slowly from magma underground, allowing ample time for crystal growth. Porphyritic texture is the presence of larger, visible phenocrysts suspended in a larger aphanitic matrix. This indicates a two-stage cooling process, where some minerals developed slowly underground in magma which was then erupted on the surface, causing the remaining minerals to form quickly.
