Does Granite Conduct Electricity? 7 Facts You Should Know

Granite is a pale-color intrusive rock that is primarily found in mountainous regions of the continental crust. Let us test the granite for electrical conductivity.

Granite is by no means an excellent conductor of electricity. Granite is an igneous mixture made of plagioclase, feldspar, and quartz. These substances are all poor electrical conductors. Quartz is comprised of silicon dioxide, just as glass.

Quartz and glass both function well as insulators. Additionally a great insulator is feldspar. We will go through the electrical conductivity of granite, how granite conducts electricity, and if marble conducts electricity.

How does granite conduct electricity?

Granite typically weighs 2.65 to 2.75 grams per cubic centimeter on average. Let us see how granite conducts electricity.

The high density of free electrons in granite makes it simpler for ions to pass charge each other. Granite has an atomic structure that allows it viable for the flow of electricity without using a lot of energy to send ions from one atom to the other. An igneous rock with high iron content is considered granite.

The application of pressure and the ensuing deformation of the rock’s constituent crystals in many different types of rock, most notably granite, transform some of the oxygen atoms in those crystals into charge carriers. These atoms are positively charged because they lack an electron.

Is granite a poor conductor of electricity?

The primary minerals in granite have thermal conductivity that range from 1.6 to 1.7 W/mK at ambient temperature. Let us check to discover if stone conducts electricity poorly.

Electricity does not conduct well through granite. Because granite is not a very good conductor of this more common form of energy, the electrons from the strained rock are unable to follow the holes.

Granite has a thermal conductivity of 0.03 W/mK at ambient temperature, which is significantly higher than that of air. As a result, the thermal conductivity decreases as the porosity increases.

Electrical conductivity of granite

All the necessary qualities needed to use granite as a dimension stone are present in granite. Let us examine granite’s electrical conductivity.

The ability of distinct granite materials to transmit an electromotive force or heated air can be used to describe granite’s electrical conductivity.

640px Granit strzelinski2
Image Credit – Granit strzelinski2 by Piotr Sosnowski (CC-BY-SA-4.0)

The following characteristics of the earth’s materials influence their electrical conductivity: the amount of clay present, their porosity, permeability, metal content, and level of pore saturation.

Does marble conduct electricity?

When limestone is subjected to the heat and pressure of metamorphism, marble is created as a metamorphic rock. Let us test the stone for electrical conductivity.

Marble does not efficiently conduct electricity. Due to the fact that most marbles restrict the flow of electricity, marble has historically been used to create electrical insulators.

Higher insulation levels make a substance less conductive because there are fewer free electrons in the material.

Does graphite conduct electricity in solid state?

Calculations indicate that graphite has a boiling point of about 3827 degrees Celsius, or 4098 degrees Kelvin. Let us check to see if solid graphite can carry electricity.

In its solid state, granite is an electrical conductor. Every carbon atom in granite forms a covalent link with three other carbon atoms, which gives the material its structure. Every carbon atom has a single final electron that is unattached to any other carbon atom and free to move.

The unconstrained free electron wanders all across the graphite matrix and forms no ties to premise or off premise. Free atoms have the ability to migrate to or from that stratum.

Does graphite conduct electricity when molten?

As carbon is pushed to the high pressure, heat of the upper crust and mantle of the earth, graphite is made. Let us see to see if molten graphite can conduct electricity.

When melted, graphite is an effective conductor of electricity. This is because of its molecular structure, which permits free movement of electrons through it.

Graphite is composed of carbon atoms with four electrons in their outer shell. While the other three electrons form a solid bond, the fourth electron is delocalized, or free to travel about. Granite’s layers fluctuate between single and double bonds. The layers can be readily traversed by electrons in this type of arrangement.

Does granite conduct heat?

Granite has a melting point of 1260 degrees Celsius. Let us check the heat conduction of granite.

Granite may transfer heat. To examine the effects of porosity and water content on thermal conductivity, the thermal conductivities of granite were tested under various conditions of porosity and water content.

Thermal conductivities for the dry samples range from 3.12 W/mK for low porosity rocks to 2.12 W/mK for rocks with a high porosity. Samples of the same granite that have been exposed to water exhibit higher thermal conductivities than dry samples.


White granite, black granite, black and white granite, pink granite, red granite, blue granite, and green granite are just a handful of the different granite colors that may be produced by mixing granite crystals. Granite has been utilized for thousands of years as a dimension stone, building material and stone, decorative stone.

Also Read: