Basalt is an extrusive igneous or volcanic rock that has a low silica content, dark in color, and very rich in iron and magnesium.
A basalt dark in color can be called the dark basalt. We find its applications in textile industries, fire protection. From these places, we get a clear idea that understanding basalt use is really important for us.
In this article, we will understand what basalt is, the use of basalt, basalt type, and more about this in detail.
Basalt is an igneous rock that is formed from the quick cooling of lava rich in magnesium and iron when exposed at or very near the surface of a terrestrial planet or the moon.
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Point to Note:
We must note that more than 90% of all volcanic rock on Earth is basalt, and the eruption/bursting of basalt lava is seen by geologists at around twenty volcanoes every year.
Basalt is also a crucial volcanic rock type on other planetary bodies in the Solar System. For example, the lunar maria are plains of flood basaltic lava flow and basalt is a common rock existing on the surface of Mars.
Now, let’s understand the basalt formation at various locations:
We can find most of Earth’s basalt at the tectonic plate boundaries in the ocean that forms a global ridge system in the middle of the ocean.
The convection currents in the mantle pass hot molten magma to the Earth’s crust via eruptions on the seabed, and therefore, forming large landscapes of pillow-shaped basalt after cooling down. However, since these activities occur far away from human observation/view, we find that seismic readings are the only way of monitoring such basalt flow.
In a similar process, we discussed above, the oceanic hotspots are known to produce huge amounts of basalt. The magma flow at any one spot can burst anytime, and continuous lava flow at such locations may slowly accumulate to become an island.
The Hawaiian Islands that we find in China were all made due to basalt eruptions.
Dark basalt (a basalt type) is formed inland, it mostly comes from large vents and fissures that deposit large amounts of basaltic lava to the surface of the Earth. These eruptions continue for a long period or a time, which ultimately result in vertical stacks or columns.
The basalt rock cycle is a process that commences over a time -period of millions of years. All the basaltic magma is pulled out of the mantle to the Earth’s crust because convection currents are continually pushed away from the fissures because of the new magma flow.
Finally, over a period of many years (millions of years), the older basalt crust slowly sinks back into the magma, ending its cycle where it began or started its formations.
Properties of Basalt
Let’s discuss some physical properties of basalt:
Rock hardness property is usually measured to determine the compressive fracture strength, to determine whether a rock is a soft rock or a hard rock. T
The rock hardness of basalt is 6 as per the Mohs scale and can be observed through a combination of its compressive strength.
Generally, 100-300 Mpa or Megapascal is the compressive strength. Its tensile strength is10-30 Mpa, and its shear strength is 20-60 Mpa, which denotes that depending on the mineral makeup, basalt rocks fall in the category of a strong – very strong.
Rock hardness property is common among the densest, fine-grained textured rocks, such as basalt.
The density of basalt is very high, the density of basalt can be seen through the combination of the porosity of the rock, i.e., 0.1 – 1%, and its bulk density is 2.8 – 3 Mg aka megagram per meter cube; It is because about 50 percent of basalt is made of silica.
Use of Basalt
Uses During Ancient Times
During the ancient period of the Roman Empire, engineers employed basalt for discovering roads, and also to make seats in areas of public performances viz: stadiums and amphitheaters.
Basalt rocks were also widely employed in mills for grinding purposes. The Rosetta Stone is also formed of basalt.
There are several uses of this rock in construction. For instance, crushed basalt is used in making the base for roads and pavements, as a part of concrete mixtures for constructing railroads, and as filter stones in drainage projects. The rock is also employed in slabs and sheets to create tiles, bricks, and other stone objects for constructing buildings and large monuments.
Many farmers and gardeners employ basalt rock dust fertilizer because it is good for increasing the growth of plants while making it tough for weeds to spread in flowerbeds or other unwanted growing areas.
The tensile strength of basalt is quite high, it is much greater than carbon fiber/fiberglass. Therefore, melted composites of the basalt rock are employed for manufacturing pipes and rebars that are used in the construction of wind turbine blades.
We often use Ophitic basalt in the medical industry for orthopedic purposes.