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What does phaneritic mean?
Phaneritic refers to igneous rock grain size,which is visible with the naked eye.
How is basalt different from gabbro?
Basalt and gabbro are both igneous rocks, with major differences in grain size and where they form. Basalt has fine-grained crystals and forms from lava flows on the Earth's surface, while gabbro has coarse-grained crystals and forms from magma cooling beneath the Earth's surface.
What is the grain size of an extrusive igneous?
The grain size of an extrusive igneous rock is typically fine-grained to aphanitic, meaning the individual mineral grains are not visible to the naked eye. This rapid cooling at the Earth's surface prevents large crystals from forming, resulting in a fine texture.
What is an aphanite?
An aphanite is a specific type of dark igneous rock with grain fine enough that individual crystals cannot be seen by the naked eye.
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 determines the mineral grain size in an igneous rock?
The rate of cooling of the magma primarily determines the mineral grain size in an igneous rock. Rapid cooling results in fine-grained rocks, while slow cooling allows for the formation of coarse-grained rocks. Additionally, the composition of the magma and the presence of nucleation sites can also influence the final grain size.
What texture does and extrusive igneous rock have?
fined grain 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.
What does a fine-grained igneous rock form from?
A fine grained igneous rock forms from Lava that escapes from the earth crust to the surface and cools and solidifies rapidly.
Igneous rock that cools very quickly when it forms may have a texture that is?
Igneous rock that cools quickly may have a fine-grained texture, with small mineral crystals that are not easily visible to the naked eye. Examples include basalt and rhyolite.
Does grain size mean anything when identifying igneous rocks?
yes, it does. when a grain size in an igneous rock is small, it means that it was probably an extrusive rock, meaning it formed on land. but if the grain size is big, it means that the rock most likely formed underground, or it was intrusive. try remembering it like this- the larger the crystals, the more time the rock had to form, and magma cools faster on land, not giving the rocks much time to form.
What is dark fine-textured rock?
Could be basalt, an extrusive igneous rock.
