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Small grained rocks have what texture?
Fine grained rocks are considered aphanitic.
Which rock has large mineral grains granite obsidian basalt or pumice?
Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the growth of large mineral crystals due to slow cooling. Obsidian, basalt, and pumice are extrusive igneous rocks that cool quickly at the Earth's surface, resulting in smaller mineral grains or a glassy texture.
Is basalt the fine-grained equivalent of gabbro?
Yes, basalt is the fine-grained equivalent of gabbro. Both rocks are formed from the same magma composition (mafic), but basalt is extrusive, cooling quickly at the Earth's surface, resulting in smaller mineral grains, while gabbro is intrusive, cooling slowly beneath the surface, resulting in larger mineral grains.
Large crystal grains in an igneous rock are an indication that crystals formed?
slowly from a magma with abundant time to grow. This can suggest an intrusive or plutonic igneous rock type, such as granite. Rapid cooling leads to small crystal grains, characteristic of extrusive or volcanic igneous rocks like basalt.
What is grain size of basalt?
The grain size of basalt varies depending on how quickly the lava cooled and solidified. Typically, basalt has a fine to medium grain size, with individual grains being less than 1 mm in size. Rapid cooling can result in a fine-grained basalt, while slower cooling may produce a coarser-grained texture.
Does basalt have large grains?
no
Which rock has large mineral grains-granite basalt obsidian pumice?
Granite has large mineral grains compared to basalt, obsidian, and pumice. It is an intrusive igneous rock formed from the slow crystallization of magma beneath the Earth's surface, allowing large crystals to develop. In contrast, basalt has smaller grains due to its rapid cooling, while obsidian is volcanic glass with no visible grains, and pumice is a light, porous rock with small, frothy bubbles.
What is the compactness of basalt?
very compact,crystal grains interlocked
What is basalt's grain size?
Basalt typically has a fine-grained texture, meaning that its individual mineral grains are too small to be seen with the naked eye. The crystals in basalt form due to rapid cooling of lava at the Earth's surface, resulting in a dense and homogeneous rock.
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.
Does basalt have small crystals or big?
Since basalt is extrusive it cools quickly and forms small crystals.
What rock is similar to basalt in mineral make up is intrusive and has coarse grains?
It is Gabbro
Small grained rocks have what texture?
Fine grained rocks are considered aphanitic.
Why do magnetic stripes appear on the seefloor?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
Why do magnetic stripes appear on the sea?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
Can two igneous rocks be made of the same minerals but have different names?
Yes. The grain texture also matters. For example, basalt and gabbro have the same mineral composition, but basalt, which forms on the surface, has microscopic grains while gabbro, which forms underground, has larger mineral grains.
Which rock has large mineral grains granite obsidian basalt or pumice?
Granite has large mineral grains compared to obsidian, basalt, and pumice. Granite is an intrusive igneous rock that forms deep within the Earth's crust, allowing for the growth of large mineral crystals due to slow cooling. Obsidian, basalt, and pumice are extrusive igneous rocks that cool quickly at the Earth's surface, resulting in smaller mineral grains or a glassy texture.
