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What is a fine-grained igneous rock composed primarily of very small crystals of quartz?
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Volcanic islands in the deep ocean are composed primarily of what igneous rock?
Basalt
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
What is a type of igneous rock that forms visible crystals?
Granite, gabbro, and diorite are a few igneous rocks that forms crystals. Igneous rocks that form visible crystals are intrusive igneous rocks, rocks that form under the earth's surface.
Do igneous have bands of crystals?
No, they do not have bands of crystals but they are all crystalline.
What do small crystals in an igneous rock mean?
The size of the crystals in an igneous rock tells us how fast the magma cooled.
Is metamorphic rock crystalline or composed of crystals?
Metamorphic, igneous, and sedimentary rock are all composed of crystals, which vary greatly in size.
Volcanic islands in the deep ocean are composed primarily of what igneous rock type?
Basaltic Igneous Rocks
Volcanic islands in the deep ocean are composed primarily of what igneous rock?
Basalt
What are the large crystals called in an igneous rock mostly composed of a finer grained matrix?
The larger crystals or masses of larger crystals are called phenocrysts.
What is a fault-block mountain?
the group of igneous rocks composed primarily of feldsper and quartz
Which two of the three rock types appear to be made primarily of intergrown crystals?
Igneous and metamorphic rocks.
Do igneous rocks have small crystals large crystals or no crystals?
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.
What is a rock composed of small crystals that are mainly dark colored that is a major component of the ocean crust?
The igneous rock basalt.
What type of igneous rock is found in the Giant's Causeway of Ireland?
The giant's causeway in Ireland is primarily composed of a type of igneous rock called basalt.
Are all lowlands are made primarily of sedimentary rocks?
Rift zones are lowlands composed of igneous rock.
What are granite and basalt?
Both are igneous rocks, formed from the cooling and solidification of magma. Granite is a felsic, intrusive igneous rock, with visible well mixed mineral crystals. Basalt is a mafic, extrusive igneous rock, composed of darker mineral crystals, most of which are not distinguishable without the aid of magnification.
How can you identify an igneous rock?
Intrusive igneous rock is composed of visible mineral crystals, possessing what is referred to as a phaneritic texture. This is evidence that slow cooling of magma occurred deep underground.
