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Where did igneous rocks form that have mineral crystals easily seen with the ununaided eye?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
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Igneous rocks that have mineral crystals easily seen with the unaided eye formed?
Intrusively.
What are rocks that have visible crystals in them classified as?
Rocks with easily visible mineral crystals are called macrocrystalline or said to possess a phaneritic texture.
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.
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.
An igneous rock with a low silica content that flows easily?
No igneous rock flows easily. However, basaltic lava can flow easily, has a relatively low silica content, and turns into basalt, the rock, when solidified.
Igneous rocks that have mineral crystals easily seen with the unaided eye formed?
Intrusively.
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.
What are rocks that have visible crystals in them classified as?
Rocks with easily visible mineral crystals are called macrocrystalline or said to possess a phaneritic texture.
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.
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 type of igneous rocks are easy to classify because the minerals that they contain can be seen and identified?
Crystals are easy to classify because the minerals that they contain are easily identified. One example of this would be emeralds. Another example of a crystal is a diamond.
An igneous rock with a low silica content that flows easily?
No igneous rock flows easily. However, basaltic lava can flow easily, has a relatively low silica content, and turns into basalt, the rock, when solidified.
What qualities of igneous rocks have long made them useful for tools igneous rock?
Extrusive igneous rock: Obsidian. Quality of conchoidal fracture making them easily workable to a sharp edge for cutting tools or weapon points. Intrusive igneous rock: Granite. Quality of durability due to high crystalline quartz and feldspar mineral mix. Also beauty. Harder to work, but a great, long lasting building stone.
What is ment by a meant by a mineral's hardness?
Hardness is the measure of how easily a mineral is scratched.
A mineral that can be scratched easily by all other minerals is?
Talc is the softest mineral and can be scratched by any other mineral.
Is obsidian an instrusive or extrusive igneous rock how do you know?
Obsidian is an extrusive rock and is formed from rapidly cooling magma. Obsidian is also known as volcanic glass and one can find only sub-microscopic crystals in it. This is because it was cooled too fastly for large crystals to form. If the material that obsidian consists of were an intrusive rock and had a lot of time to cool down, one would find that it would be composed of easily visible crystals.
