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Very large silicate mineral grains (crystals) indicate extremely fast, in-melt transport of the mineral constituents to the growing crystals. We know that pegmatite magmas are small volume, relatively low temperature melts that are extremely rich in water and other dissolved volatiles. The volatiles promote very fast rates of material transfer, thus accounting for rapid growth of very large crystals.
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Why are exceptionally large mineral crystals found in pegmatite?
They are associated with the late stages of granite intrusions and the minerals formed in pegmatites literally had the time to enjoy the benefits of a slow crystallization process from a rich chemical stew produced by the cooling granite. For an alternate hypothesis, see the link below.
What are veins of extremely coarse grained igneous rocks called?
Veins of extremely coarse-grained igneous rocks are referred to as pegmatites. These veins are formed from the last minerals to crystallize in a cooling magma, resulting in very large crystals. Pegmatites can contain economically valuable minerals such as lithium, beryllium, and rare earth elements.
What are veins of extremely coarse-grained igneous rocks called?
Veins of extremely coarse-grained igneous rocks are called pegmatites. These veins form from the crystallization of mineral-rich magma, resulting in very large crystals due to slow cooling and high water content. Pegmatites are commonly found in association with granitic rocks.
Vein deposits of extremely large-grained minerals that can contain rare ores such as lithium and beryllium?
These deposits are likely pegmatites, which are igneous rocks with exceptionally large crystals. Pegmatites can host rare minerals and ores due to their unique formation process, which involves late-stage crystallization of magma enriched in rare elements like lithium and beryllium. These deposits are important sources for these rare metals and are often mined for their economic value.
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.
Are igneous rocks formed from smalll minerals?
Not necessarily. Intrusive igneous rocks, especially pegmatites, can have large crystals.
How do the crystals in the pegmatites form?
slow cooling of gaseous magma
What are teardrop shaped bodies with large crystals such as gemstones that form when magma moves upward?
Teardrop-shaped bodies with large crystals, often referred to as "pegmatites," form when magma cools slowly, allowing large crystals, such as gemstones, to develop. These formations typically occur in the final stages of magma crystallization, where the temperature and pressure conditions create an environment conducive to the growth of sizable mineral crystals. Pegmatites are commonly found in granitic environments and can contain rare minerals and gemstones due to the concentration of elements during crystallization.
Why are exceptionally large mineral crystals found in pegmatite?
They are associated with the late stages of granite intrusions and the minerals formed in pegmatites literally had the time to enjoy the benefits of a slow crystallization process from a rich chemical stew produced by the cooling granite. For an alternate hypothesis, see the link below.
What are veins of extremely coarse grained igneous rocks called?
Veins of extremely coarse-grained igneous rocks are referred to as pegmatites. These veins are formed from the last minerals to crystallize in a cooling magma, resulting in very large crystals. Pegmatites can contain economically valuable minerals such as lithium, beryllium, and rare earth elements.
What are veins of extremely coarse-grained igneous rocks called?
Veins of extremely coarse-grained igneous rocks are called pegmatites. These veins form from the crystallization of mineral-rich magma, resulting in very large crystals due to slow cooling and high water content. Pegmatites are commonly found in association with granitic rocks.
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.
Vein deposits of extremely large-grained minerals that can contain rare ores such as lithium and beryllium?
These deposits are likely pegmatites, which are igneous rocks with exceptionally large crystals. Pegmatites can host rare minerals and ores due to their unique formation process, which involves late-stage crystallization of magma enriched in rare elements like lithium and beryllium. These deposits are important sources for these rare metals and are often mined for their economic value.
What is a pegmatite texture?
A pegmatite is an intrusive igneous rock comprised of coarse, interlocking mineral grains usually above three centimeters in diameter. Although very many pegmatites are granitic in composition, several hundred mineral species have been found in the most famous pegmatites worldwide, including many rare and valuable minerals. A few discovered pegmatite crystals have grown to several meters across.
How are the ways in witch pluton and pegmatite minerals form similar?
Both plutons and pegmatites are formed from the slow cooling of molten rock beneath the Earth's surface. This slow cooling allows for the formation of large mineral crystals. Additionally, both plutons and pegmatites can contain a variety of minerals, often including rare or uncommon ones due to the unique conditions of their formation.
Why are Pegmatite crystals so big?
They are associated with the late stages of granite intrusions and the minerals formed in pegmatites literally had the time to enjoy the benefits of a slow crystallization process from a rich chemical stew produced by the cooling granite.
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.
