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A slow rate of cooling. The slower a magma cools, the longer the crystals have to grow, thus the bigger they will be.

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Q: What rate of cooling produces the largest crystals in igneous rocks?
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What structures form from the cooling and hardening of magma beneath earth's surface?

When magma cools slowly deep underground it produces a rock with larger crystals than when the magma (or lava) cools quickly near (or on) the surface.Rocks with the largest crystal structure are described as 'pegmatitic'.Rocks with crystals visible to the naked eye are described as 'phaneritic'.Rocks with no apparent crystal structure are called 'aphanitic'


Which igneous rocks would contain the largest crystals?

Pegmatite. Individual crystals can be as large as a bathtub. Pegmatites are the last rocks to crystallize from a solidifying body of magma. The large size of the crystals results from the slow rate of cooling and the presence of large amounts of water dissolved in the magma.


Where would you expect to find the largest crystals in a lava flow?

You would find the largest crystals in a lava flow in the center of the flow. The largest forms of igneous intrusions are called batholiths.


Which type of rock typically has the largest formed crystals?

Igneous rocks usually contain the most crystals. The longer it takes the magma to cool, the larger the crystals. According to the Earth Science Reference Tables, pegmatite contains the largest crystals.


What are the largest crystals on earth?

The beryl crystals


What type of rock has interlocking crystals that are mainly white?

Mineral crystals in rock can be interlocked when forming or metamorphosed, or simply cemented together. Rocks with interlocking crystals tend to resist breakage by a force better than cemented rock.


What is the largest igneous intrusive body?

The largest type of intrusion is the pluton.


What is the largest of all the igneous?

The largest of all igneous intrusions is called a batholith. Batholiths are formed by the massive invasion of hot magma into country rock.


What is the largest of all igneous intrusions?

The largest of all igneous intrusions is called a batholith. Batholiths are formed by the massive invasion of hot magma into country rock.


Where and what was the largest crystal found?

Quartz crystals have been found that are over 30 meters in length. For a list of the world's largest mineral crystals, click on the link below.


What is the largest discordant body of intrusive igneous rock?

batholiths


What is the name of the largest crystals on the earth?

The largest crystal in the world is called the Nacia it is found in Mexico.