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Yes, the crystals in dolerite are generally larger than those in basalt. Dolerite, also known as diabase, is an intrusive igneous rock that cools more slowly beneath the Earth's surface, allowing larger crystals to form. In contrast, basalt is an extrusive igneous rock that cools rapidly at the surface, resulting in smaller crystals. Thus, the crystal size in dolerite typically exceeds that of basalt.
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Which has smaller crystals basalt or granite?
Basalt typically has smaller crystals than granite. This is because basalt cools and solidifies quickly on the Earth’s surface, limiting crystal growth, while granite forms beneath the surface and has more time for larger crystals to develop.
Why are the crystals in pillow basalt smaller than the crystals in basalt that forms in the ground?
Pillow basalt is formed from solidifying lava which erupts under the surface of a body of water. Because of this, it cools much faster, allowing less time for crystal growth.
What are two extrusive igneous rock that contain crystals?
Basalt and rhyolite both are extrusive igneous rock that contains mineral crystals. However, the mineral crystals are normally less than 1 mm in diameter, and are therefore not discernible without magnification.
What are the crystals in basalt that formed underwater smaller than those in the basalt that formed on the ground?
The crystals in basalt that formed underwater are typically smaller due to the rapid cooling of lava when it comes into contact with water. This rapid cooling prevents the crystals from having enough time to grow larger, resulting in a finer-grained texture. In contrast, basalt that cools on the ground generally does so more slowly, allowing for the formation of larger crystals. This difference in cooling rates is a key factor in the size disparity of the crystals.
Is an intrusive crystal bigger than an extrusive crystal?
Typically, intrusive crystals are larger than extrusive crystals because intrusive rocks cool slowly beneath the Earth's surface, allowing larger crystals to form, while extrusive rocks cool quickly at the surface, producing smaller crystals.
Which has smaller crystals basalt or granite?
Basalt typically has smaller crystals than granite. This is because basalt cools and solidifies quickly on the Earth’s surface, limiting crystal growth, while granite forms beneath the surface and has more time for larger crystals to develop.
Why are crystals in basalt that formed under water smaller than those in basalt that formed on ground?
Crystals in basalt that formed underwater are smaller because they cool faster in the water, resulting in less time for the crystals to grow. On the other hand, crystals in basalt that formed on the ground have more time to grow as they cool more slowly, leading to larger crystal sizes.
What is basalt crystal size?
Basalt typically has a fine-grained crystal size, usually referred to as aphanitic, meaning the crystals are too small to be seen with the naked eye. This results in a smooth or glassy texture in basalt rocks.
Why are the crystals in pillow basalt smaller than the crystals in basalt that forms in the ground?
Pillow basalt is formed from solidifying lava which erupts under the surface of a body of water. Because of this, it cools much faster, allowing less time for crystal growth.
Dolerite and gabbro are both igneous rocks Dolerite has crystals about 1 mm across and gabbro has crystals about 5 mm across What does this indicate about the formation of these rocks?
In comparison to the slower cooled magma that created the gabbro, the dolerite has formed closer to the surface. This means that there was less time for crystal growth before it cooled into rock, resulting in the difference in crystal size between the two.
Why are the crystals smaller in basalt pillows?
Pillow basalt forms underwater. Water absorbs heat from lava much more quickly than air does.
What rock has larger crystals than basalt and granite?
A pegmatite is a rock formed under certain favorable circumstances that enhance the crystal size of the rock. The crystals would be larger than those in basalt, an extrusive igneous rock, and granite, and intrusive igneous rock.
What are two extrusive igneous rock that contain crystals?
Basalt and rhyolite both are extrusive igneous rock that contains mineral crystals. However, the mineral crystals are normally less than 1 mm in diameter, and are therefore not discernible without magnification.
What is different from crystals underground than above?
Underground crystals are bigger where as crystals formed on the surface are smaller.
What are the crystals in basalt that formed underwater smaller than those in the basalt that formed on the ground?
The crystals in basalt that formed underwater are typically smaller due to the rapid cooling of lava when it comes into contact with water. This rapid cooling prevents the crystals from having enough time to grow larger, resulting in a finer-grained texture. In contrast, basalt that cools on the ground generally does so more slowly, allowing for the formation of larger crystals. This difference in cooling rates is a key factor in the size disparity of the crystals.
How does a basalt differ from gabbro?
Basalt is a fine-grained volcanic rock, usually dark in color, while gabbro is a coarse-grained intrusive rock that is also dark in color. Basalt tends to cool and solidify quickly on the Earth's surface, resulting in a fine-grained texture, whereas gabbro cools slowly beneath the surface, allowing larger mineral crystals to form.
What is the difference between granite and dolerite?
Granite is a coarse-grained igneous rock composed mainly of quartz, feldspar, and mica. Dolerite, also known as diabase, is a medium- to coarse-grained intrusive igneous rock with a composition similar to basalt. One key difference is that granite forms at shallow depths within the Earth's crust, while dolerite forms at deeper levels.
