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Does obsidian a glassy rock have a large grain size or a small grain size?
Wiki User
∙ 14y ago
Actually, obsidian doesn't have grains at all. Technically obsidian is a glass, which means it has no internal structure. When geologists refer the the grain size of a rock, they mean how big the crystals that make it up are. Since obsidian has no crystals, it therefore has no grain size.
Wiki User
∙ 14y ago
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Does obsidian have a large grain size or a small grain?
Neither. It has no visible grain.
What is an extrusive igneous rock that is actually glass?
One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps
What is a black volcanic rock with small crystals?
Obsidian volcanic glass formed by quenching of magma. It is typically black, smooth and has a glassy to vitreous luster.
Which rock texture is formed from fast cooling?
When lava cools very suddenly (a process known as quenching), it creates a glassy, or hyaline, texture. This sudden cooling also creates very small, often microscopic, crystals in the rock. The most well-known example of a glassy textured igneous rock is obsidian.
Did obsidian cool quickly or slowly?
Obsidian cooled very quickly. It's a vulcanic glass, meaning that the crystals are so small, they had virtually no time to form an orderly crystalline texture, and are basically placed randomly. Smaller grain size is associated with faster cooling.
Does obsidian have a large grain size or a small grain?
Neither. It has no visible grain.
What is an extrusive igneous rock that is actually glass?
One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps
What is a black volcanic rock with small crystals?
Obsidian volcanic glass formed by quenching of magma. It is typically black, smooth and has a glassy to vitreous luster.
Which rock texture is formed from fast cooling?
When lava cools very suddenly (a process known as quenching), it creates a glassy, or hyaline, texture. This sudden cooling also creates very small, often microscopic, crystals in the rock. The most well-known example of a glassy textured igneous rock is obsidian.
What is the weight of obsidian?
The weight of a small quantity of obsidian is 17g
Which type of rock that will have small crystals if cooled rapidly?
== == The crystals will be small or may not form at all. Fast cooling magma produces small crystals. Slow cooling magma produces larger crystals. The longer a mineral has to form at its crystal growing temperature range, the larger the crystals will be.
Did obsidian cool quickly or slowly?
Obsidian cooled very quickly. It's a vulcanic glass, meaning that the crystals are so small, they had virtually no time to form an orderly crystalline texture, and are basically placed randomly. Smaller grain size is associated with faster cooling.
The british policy of combining many small into one large farm is known as?
small scale grain production
What are small dark glassy objects from meteorites called?
Tektites
What texture do igneous rock have when magma cools?
It can be described as aphanitic. This just means that the rock has very small, hard to see crystals. The crystals do not have time to grow large when they are exposed to the air so they cool quickly and remain small. If water is added to the melt, the texture can be described as glassy (like obsidian).
Explain pegmatite is coarse grained with large crystals basalt is fine grained with small crystals and obsidian has no crystals?
Crystal size in these rock types is determined by their rate of cooling. Pegmatites have large crystals due to very slow cooling. Obsidian has microscopic crystals due to almost instantaneous cooling.
What do Romans use to move things?
They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.They used various ways to move things, depending on what they were moving. They had carts and wagons for relatively small items, ships for large quantities of grain or oil or wine amphora, carriages for people, and sledges for large stones or slabs.
