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Where did igneous rocks form that have mineral crystals easily seen with the ununaided eye?
Igneous rocks can form anywhere, but some, like granite and gabbro, have particularly large crystals (perhaps 5 or more mm across). These are intrusive rocks, and as they are insulated by a lot of rock around them, cool very slowly, forming large crystals. They form deep, often a few kilometres, below the surface of the earth.
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.
What is a shiny mineral that occurs in sheets?
Mica is a shiny mineral that occurs in sheets. It is composed of thin, flat sheets that can easily be peeled apart. Mica is commonly found in igneous and metamorphic rocks.
How do intrusive and extrusive igneous rocks form?
Igneous rocks are formed when magma crystallizes and cools into a solid form. There are two types of igneous rocks--intrusive igneous rocks and extrusive igneous rocks.Intrusive:Intrusive igneous rocks are formed when the melted rock (magma) slowly rises toward, but does not reach the surface. As these pockets of magma cool slowly underground, minerals crystallize and the magma solidifies, becoming intrusive igneous rock, like granite and gabbro.Extrusive:Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the Earth's surface. When magma appears above the surface, it is called lava. Extrusive igneous rocks are formed as the lava cools above ground. Examples of extrusive igneous rock are basalt, rhyolite, pumice, and scoria.igneous rocks are formed by lavaWell When melted rock cools quickly, it hardens before any mineral crystals can grow large. as a result, igneous rocks that form above ground have small or no crystals :)Igneous Rocks are made of magma and lava because it comes out of a volcanoFrom volcanoes.from lava cooling.Molten rock cools and turns solid.
What is poikilitic texture?
Poikilitic texture refers to crystals, typically phenocrysts, in an igneous rock which contain small grains of other minerals. The texture is most easily observed in petrographic thin sections.
Where did igneous rocks form that have mineral crystals easily seen with the ununaided eye?
Igneous rocks can form anywhere, but some, like granite and gabbro, have particularly large crystals (perhaps 5 or more mm across). These are intrusive rocks, and as they are insulated by a lot of rock around them, cool very slowly, forming large crystals. They form deep, often a few kilometres, below the surface of the earth.
How can you determine if a igneous rock has had an intrusive or extrusive origin?
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
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.
What type of rock is a crystal rock?
Virtually all rock contains mineral crystals of various sizes. Most volcanic rocks such as granite contain crystals of quartz and other minerals. Crystal size varies depending on the speed of cooling.
What type of igneous rocks are easy to classify because the minerals that they contain can be seen and identified?
Rocks with large, easily identifiable minerals, such as granite and diorite, are easy to classify. These rocks belong to the intrusive igneous rock category and typically have distinct mineral compositions that allow for easy identification.
What is a shiny mineral that occurs in sheets?
Mica is a shiny mineral that occurs in sheets. It is composed of thin, flat sheets that can easily be peeled apart. Mica is commonly found in igneous and metamorphic rocks.
What is a mixture where the different parts can be identified easily with the unaided eye?
The answer is heterogeneous
Does sandstone have crystals?
Sandstone typically does not have crystals. It is primarily composed of sand-sized mineral particles that are cemented together, giving it a granular appearance. If sandstone does contain crystals, they are usually very small and not easily visible to the naked eye.
How do intrusive and extrusive igneous rocks form?
Igneous rocks are formed when magma crystallizes and cools into a solid form. There are two types of igneous rocks--intrusive igneous rocks and extrusive igneous rocks.Intrusive:Intrusive igneous rocks are formed when the melted rock (magma) slowly rises toward, but does not reach the surface. As these pockets of magma cool slowly underground, minerals crystallize and the magma solidifies, becoming intrusive igneous rock, like granite and gabbro.Extrusive:Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the Earth's surface. When magma appears above the surface, it is called lava. Extrusive igneous rocks are formed as the lava cools above ground. Examples of extrusive igneous rock are basalt, rhyolite, pumice, and scoria.igneous rocks are formed by lavaWell When melted rock cools quickly, it hardens before any mineral crystals can grow large. as a result, igneous rocks that form above ground have small or no crystals :)Igneous Rocks are made of magma and lava because it comes out of a volcanoFrom volcanoes.from lava cooling.Molten rock cools and turns solid.
Metamorphic rock that consist of only mineral that forms large interlocking crystals often have what type of texture?
Metamorphic rocks that consist of only one mineral and have large interlocking crystals often have a coarse-grained texture. This means that the individual mineral grains are easily visible to the naked eye. Examples of such rocks include quartzite (formed from quartz) and marble (formed from calcite).
What is poikilitic texture?
Poikilitic texture refers to crystals, typically phenocrysts, in an igneous rock which contain small grains of other minerals. The texture is most easily observed in petrographic thin sections.
What is a mineral with smooth flat sheets?
Mica is a mineral that often forms smooth flat sheets. It is known for its perfect cleavage and ability to be easily split into thin, flexible layers. Mica is commonly found in igneous and metamorphic rocks.
