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When samples of magma are cooled quickly they do not have time to develop any crystal structure. The liquid sample will turn into a glassy solid. Under natural conditions this rapid cooling would result in a material known as obsidian. This is a black to brownish material that has all the characteristics of glass; conchoidal fracture, hardness, light transmission in thin edges, etc. depending on the type of magma.
Obsidian, even though seemingly a solid, is called a super-cooled liquid, just like window glass. There is no crystal structure at first but over a long period of time crystals will start to grow within the obsidian. This is known as "snowflake obsidian" because the crystals are suspended like flakes in ice. It has been said that there is no obsidian older than 10,000 years as it has all crystallized in that time.
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∙ 14y ago
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∙ 16y agoExtrusive igneous rock.
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What texture does magma in two cooling stages first slowly then quickly?
very coarse
Magma that cools slowly forms what kind of rock?
Intrusive igneous rocks are formed by slow cooling magma below the earth's surface. Extrusive igneous rock is formed by magma cooling quickly, at or near the surface.
How do igneous rocks with glassy textures form and where?
They form from the extremely rapid cooling of lava or magma. The quick cooling does not allow time for the crystallization of minerals, resulting in the formation of a natural glass.
Do intrusive igneous rocks form quickly or slowly?
Fast and slow are relative terms. If a heated igneous rock takes 3 hours to cool, is that fast or slow? During their formation, however, magma can solidify very slowly or very quickly. Rocks that have cooled quickly from magma are referred to as extrusive igneous rocks, such as obsidian and scoria. Rocks that have formed from slow cooling magma are called intrusive igneous rocks, such as granite and gabbro. The difference between the two types is in their grain size. Slow cooling magma produces large grained rock, and fast cooling magma produces fine-grained rock.
Do large well -formed crystals cool quickly?
Large, well formed crystals form in solutions that cool rapidly. When solutions cool slowly, crystals are more likely to nucleate in higher numbers at the same time, leading to many very small and irregular shaped crystals.
What texture does magma in two cooling stages first slowly then quickly?
very coarse
Magma that cools slowly forms what kind of rock?
Intrusive igneous rocks are formed by slow cooling magma below the earth's surface. Extrusive igneous rock is formed by magma cooling quickly, at or near the surface.
Where would the cooling process most likely be very slow for magma?
Very deep underground.
What is the origin of obsiadan?
If you are asking about how they were formed magma from volcano that are shot in the air of quickly spewed out causing the magma to cool very quickly forming a very smooth surface on obsidian. Becuase the magma cooled so fast it couldn't slowly cool into a rough textured rock.
How is an igneous rock's texture determined by the rate of cooling of magma?
yes, slowly cooling magma will crystallize (granite). If it cools quickly, the lava will have very small crystals and will contain air pockets (pumice, if it is cooled in chunks) or can even be very thin, like hair, very straight. (Pele's hair)
Rapidly cooling lava or magma forms very small 'blank'?
It forms very small crystals, not visible without magnification.
What is the simplified pattern that illustrates the order in which minerals crystallize from cooling magma?
when magma cools fast you get smaller crystals when it cools slow you get large crystals its very simple
Volcanic glass forms when magma cools very quickly?
Yes obsidian is glassy because it cooled very fast.
How do igneous rocks with glassy textures form and where?
They form from the extremely rapid cooling of lava or magma. The quick cooling does not allow time for the crystallization of minerals, resulting in the formation of a natural glass.
What is the name given to the volcanic glass that forms due to very rapid cooling of magma?
Yes obsidian is glassy because it cooled very fast.
What are the difference between the sizes of the particles in granite with those in basaalt?
The crystals in granite, being intrusive in nature, will be larger than those in basalt, an extrusive igneous rock. Intrusive igneous rocks have cooled slowly from magma, extrusive rocks have cooled quickly from magma. Crystals grow larger from slow cooling magma.
Why is the magma moving under the lithosphere?
Magma moves under the lithosphere because the aesthenosphere (and magma) are ductile - they act as a fluid, although a very viscous one, and they do flow. The viscosity of a magma depends on its mineral composition. Magma will move in convection currents throughout the aesthenosphere due to the heating and cooling of it as it travels throughout the aesthenosphere.
