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All molten rock is capable of cooling quickly into fine-grained rocks, but here are some common fine-grained igneous rocks:
Basalt
Obsidian
Andesite
Rhyolite
Tuff (a rock made from volcanic ash)
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∙ 12y ago
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∙ 15y agoWhen igneous rocks form by cooling quickly, their microstructure includes fine grains. It is the aphanitic igneous rock that includes andesite, basalt, and rhyolite. Wikipedia has more information, and a link is provided below. If you wish to wade on into the depths of rock microstructures, you can link on from there.
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∙ 15y agoUsually plutonic or intrusive igneous rocks.
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∙ 13y agoNo igneous rock is fine grained due to slow cooling of magma. Slow cooling magma produces rocks with visible, larger grains.
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∙ 14y agointrusive rocks
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∙ 14y agoextrusive intrusive
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∙ 14y agoextrusive rocks such as obsidian
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∙ 15y agoExtrusive igneous rocks such as basalt.
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∙ 13y agoPlutonic (intrusive) igneous rocks.
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What are veins of extremely coarse-grained igneous rocks called?
pegmatites
What are veins of extremely coarse grained igneous rocks called?
pegmatites
What do Granite and diorite have in common?
They are both coarse-grained intrusive igneous rocks
What do granite and gabbro have in common?
They are both coarse grained intrusive igneous rocks
What name is applied to coarse grained felsic igneous rocks?
Granitoid or granitic.
How fast do coarse grained and fine grained rocks cool?
If the rocks are igneous then in general:- Coarse = slowly. Fine = fast. However if the rocks are metamorphic or sedimentary then grain size has nothing to do with cooling and indicates other things.
Why are extrusive igneous rocks not coarse grained?
Because the rapid cooling does not allow much time for crystal growth.
Where do coarse-grained igneous rocks form?
Coarse-grained igneous rocks are formed when magma cools slowly deep inside the Earth. Creating big crystals in them.
Do metamorphic rock and igneous rock have fine grained and coarse grained?
Yes. Exactly, they do have both, fine grained and coarse grained rocks.
Which igneous rocks are fine grained to due to fast cooling?
Extrusive igneous rocks are fine grained due to fast cooling. They cool at a faster rate than most igneous rocks.
Do Coarse-grained igneous rocks cool rapidly from magmas?
no
What are veins of extremely coarse-grained igneous rocks called?
pegmatites
What are veins of extremely coarse grained igneous rocks called?
pegmatites
What kind of igneous rock texture results from slow cooling magma?
A coarse grained texture, referred to as a phaneritic texture, will be the resultant igneous rock texture. The slower the magma cools the more time minerals have to crystallize and thus grow bigger.
What do Granite and diorite have in common?
They are both coarse-grained intrusive igneous rocks
What do granite and gabbro have in common?
They are both coarse grained intrusive igneous rocks
What name is applied to coarse grained felsic igneous rocks?
Granitoid or granitic.
