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The rock is said to be extrusive or possess an aphanitic texture, as a result of relatively rapid cooling.
A fine grained rock texture is referred to as aphanitic.
It is called a porphyry.
vitreous or glassy (obsidian)
Basalt, Rhyolite, Andesite
Aphanitic, usually extrusive.
It's an igneous porphyry.
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.
you would find igneous rocks with small crystals at the bottom of the volcano, this is because when the rocks crack. It brakes apart into igneous rocks
Granular texture.
If igneous, it is called a porphyry.
It's an igneous porphyry.
Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals. A black extrusive igneous rock with small crystals could be basalt.
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.
The size of the crystals in an igneous rock tells us how fast the magma cooled.
small crystals
Small
you would find igneous rocks with small crystals at the bottom of the volcano, this is because when the rocks crack. It brakes apart into igneous rocks
The rock is said to be extrusive or possess an aphanitic texture, as a result of relatively rapid cooling.
Andesite is an Igneous Rock. It has small crystals because it cooled quickly d;D
Rhyolite.
Small ones.
Granular texture.