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Metamorphic.
Wiki User
∙ 11y ago
Gneiss is a type of metamorphic rock that often exhibits large intergrown crystals in thin bands. It forms from the transformation of pre-existing rocks under high temperature and pressure conditions, resulting in a banded appearance with distinct layers of different mineral compositions and grain sizes.
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What are large mineral crystals commonly found in?
large mineral crystals are most likely found or have grown in igneous or metamorphic rocks
Which Is what allows large crystals to form?
When magma coos slowly, it allows large crystals to form. The process of evaporation helps to form crystals.
What conditions lead to the formation of large crystals in an igneous rock?
Igneous rocks will develop large crystals is they cool slowly underground.
Do intrusive rocks have large crystals because they cool quickly?
No. Intrusive igneous rocks have large crystals because they cool slowly.
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.
Do igneous rocks have large crystals?
Yes, they can. Extrusive igneous rocks, which form outside the Earth's surface, often contain small or no crystals, because they cool quickly and the particles in the lava do not have much time to arrange themselves. Intrusive rocks, which form inside the Earth, generally have large crystals because they cool slowly. Granite is an example of an igneous rock with large crystals.
What are large mineral crystals commonly found in?
large mineral crystals are most likely found or have grown in igneous or metamorphic rocks
Are large crystals found in diorite?
diorite crystals are large and andesite crystals are small
Do igneous rocks have small crystals large crystals or no crystals?
It depends on the type of igneous rock. Intrusive igneous rocks such as granite have large crystals, extrusive igneous rocks may have small crystals as in basalt or no crystals as in pumice.
Which Is what allows large crystals to form?
When magma coos slowly, it allows large crystals to form. The process of evaporation helps to form crystals.
A rock with large crystals surrounded by small crystals is called?
porphyry
Are basalt crystals large in size?
No. Basalt generally has small crystals.
Does pumice have large or small crystals?
Pumice does not have crystals. It is made of glass.
What condition lead of the formation of large crystals in an igneous?
Igneous rocks will develop large crystals is they cool slowly underground.
Slow cooling of hot magma lead to the formation of what crystals?
large crystals
What are Igneous rocks that have large crystals and small crystals?
Such rocks are called porphyritic.
What do Instructive rocks have?
There are LARGE CRYSTALS....
