What Is The Density Of Rock? 

Calculating the density of rock is not that easy because rocks are available in irregular forms and there are so many types of rocks. And it becomes tough to determine the volume of the rocks. But don’t worry, below we will give you two methods to find the volume of any rock. Rock is very hard, therefore we use them as an adjective like he is so hard as a rock. In the scientific language, the rock means the naturally occurring and coherent aggregate of one or more minerals. There are so many types of rocks, including igneous, sedimentary, metamorphic, and many more. So, without doing too much discussion let’s get started and know the density of rock.  

What Is The Density Of Rock?

The density of rock is between 2.6 and 2.7 g/cc, the most of the rocks comprising the crust of the earth have the same density as given. The densities of rocks are normally expressed as specific gravity, which is the density of the rock relative to the density of water. This is not as complicated as you think because the density of water is 1 g/cm3. Therefore, these numbers translate directly to g/cm3, or t/m3.

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The density of a rock in water is between 2.6 and 2.7 g/cc. There are types of rocks like sedimentary rock, granite rock, and silicate rock. So, the density of sedimentary rocks is between 1.20 and 3.30 g/cm3, and the density of granite rock kg/m3 is 1463.64 kg/m3. While the density of silicate rock is 3 g/cm3. Let’s know the rock density in other units also. 

The density of rock kg/m3 is 1600 kg/m3, the density of rock g/cm3 is between 2.6 and 2.7 g/cm3, and the density of rock lb/ft3 is 95 lb/ft3. 

Now, you know the density of rock per cubic foot. Let’s have a look at the density of rock definition

Definition Of Density Of Rock

The density of rock is defined as a measure of the mass of a rock per unit measure of the volume of the rock. Rock densities are useful to engineers, of course. They are also essential for geophysicists who must model the rocks of the earth’s crust for calculations of local gravity. Do you know? The rock density is very sensitive to the minerals that compose a particular rock type. Sedimentary rocks, which are rich in quartz and feldspar, tend to be less dense than volcanic rocks. The formula of the rock density is as, 

The density of rock = mass of the rocks/volume of the rocks g/cc 


                            D = m g/cc 

Where, d is the density of rock 

             m is the mass of rock 

             v is the volume of rock. 

To learn about how to find the rock density, take a look at the following paragraph. 

How To Calculate Density Of Rock?

Calculating the rock density is very easy as they are solid in nature. Let’s calculate the rock density as 

  • First of all, determine the mass and volume of the rock. 
  • To determine the volume of rock you can follow any method out of the water displacement method and formula method. 
  • If the selected rock is irregular in shape then go with the water displacement method. 
  • Now, divide the mass by volume, and you will get the rock density. 

Let’s understand it with the help of an example. 

A rock of irregular shape with a volume of 10 cm3 and its weight is about 200.25 grams. Find its density. 

By using the density formula, 

The density of rock = mass of the rocks/volume of the rocks g/cc                           

                             d = 200.25/10 

                             d = 20.025 g/cc 

Let’s find out the densities by visiting Denseme


What Is Bulk Density Of Rock?

In rock: Density. The bulk density of a rock is ρB = WG/VB, where WG is the weight of grains (sedimentary rocks) or crystals (igneous and metamorphic rocks) and natural cements, if any, and VB is the total volume of the grains or crystals plus the void (pore) space.

Which Rock Is The Least Dense?

The kind of rock with the lowest density, making it the lightest, is pumice. It has a density of less than one.

How Do You Find The Density Of A Rock?

Divide the mass of the rock by its volume to calculate the density of the rock. In our example, the density is 20.4/8 = 2.55 g/cubic cm. Divide the rock density by the density of water to calculate the specific gravity.

What Is The Density Of Rock In G Cm3?

Around 3 g/cm3

Typical densities for gasses are on the order of thousandths of grams per cubic centimeter. Liquids often have densities of about 1.0 g/cm3, and indeed, fresh water has a density of 1.0 g/cm3. Rocks often have a density around 3 g/cm3, and metals often have densities above 6 or 7 g/cm3.

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What Is The Density Of A Small Rock?

Most ordinary chondrites are in the range 3.0 to 3.7 g/cm3, which is denser than most terrestrial rocks. For example, limestone (2.6 g/cm3 or less), quartzite (2.7 g/cm3), and granite (2.7-2.8 g/cm3) are all common low-density rocks.

What Rocks Have High Density?

Density of Common Rocks

  • Igneous and metamorphic rock are generally more dense than sedimentary rocks.
  • Mafic igneous rocks are generally more dense than felsic igneous rocks.
  • Higher metamorphic grade rocks such as eclogite and amphibolite are more dense than low grade metamorphic rocks such as slate and phyllite.

What Determines The Density Of A Rock?

The densities of rocks depend on numerous factors including the texture and mineral content. Sedimentary rocks tend to be less dense than metamorphic and igneous rocks, as they are more porous. The porosity of a sedimentary rock can vary depending on the sediment size and shape.


In this article, you have learned about the rock density and their types. Density, combined with observations and additional tests, helps identify and differentiate one rock from another. Since density measures the ratio of mass to volume, calculating density requires accurately measuring mass and volume. Which we have given above. Do you know? Rocks range from a collection of crystals of one mineral to mixtures of different minerals. The minerals may be microscopic or the mixture of macroscopic and microscopic crystals. Now, you may get cleared about the density of rock


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