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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.
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.
Why are the crystals in pillow basalt smaller than those in many other examples of basalt?
A factor that determines crystal size in igneous rocks is the speed in which the lava/ magma crystallised or froze. As pillow basalts form at mid ocean ridges where magma is erupted into direct contact with the cold sea water the crystals form very fast and are therefore small. Other basalts erupted on land still have relatively small crystals and crystallised relatively fast but overall slower then pillow basalts.
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.
Do igneous rocks have small crystals large crystals or no crystals?
Igneous rocks can have both small and large crystals, depending on how quickly they cool. If an igneous rock cools slowly beneath the Earth's surface, it can form large crystals, while rapid cooling at the Earth's surface or in an eruption can result in small or no visible crystals.
How willl the sizen of crystals in granite b different from the size of the crystals in basalt?
The will be large in an extrusive granite and fine in an intrusive basalt.
What is the size of basalt crystals?
relativity small
How big are basalt crystals?
small
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.
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.
Are crystals in dolerite bigger than the crystals basalt?
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.
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.
Why are the crystals in pillow basalt smaller than those in many other examples of basalt?
A factor that determines crystal size in igneous rocks is the speed in which the lava/ magma crystallised or froze. As pillow basalts form at mid ocean ridges where magma is erupted into direct contact with the cold sea water the crystals form very fast and are therefore small. Other basalts erupted on land still have relatively small crystals and crystallised relatively fast but overall slower then pillow basalts.
Does basalt have small crystals or big?
Since basalt is extrusive it cools quickly and forms small crystals.
What is the Average grain size of basalt?
The average grain size of basalt typically ranges from 0.5 to 1 millimeter, as it is a fine-grained volcanic rock. This small grain size results from the rapid cooling of lava during volcanic eruptions, which inhibits the growth of large crystals. However, some basalt may exhibit slightly larger grains in specific contexts, such as in porphyritic basalt where larger phenocrysts are embedded in a finer matrix. Overall, basalt is characterized by its relatively uniform and small grain texture.
What is the comparison of granite and basalt in terms of origin and texture which is intrusive and which is extrusive?
Basalt can't see crystals and basalt is extrusive. Granite you can see the crystals and is intrusive.
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.
