Lava Rock is, as you know, the result of Volcanic activity, and therefore pretty well disposed to handling the comparatively low temperatures of a fire pit or fireplace.
It is formed as Volcanic rock or magma rises to the surface and begins to cool at the same time as releasing gas, which creates the rough surface of the Lava.
For many years, it had been used as the finishing touch in fire pits and fireplaces. More recently, it has taken a back seat to more colorful fire glass.
However, even if it does not have the staring role in your fire feature, it still has an important and practical function to fulfill.
How To Use Lava Rock as a Filler
Fire Glass has double the density of Lava Rock, which means that a 10 lb bag of Lava will fill twice the area/space than a 10 lb bag of fire glass.
People are often surprised by how much Fire Glass they need to finish off their fire pit.
The ‘Pro Tip” here is to use a small-sized Lava Rock as a filler underneath your fire glass. Generally, this reduces the amount of fire glass you need by about half!
We recommend using the 1/4 to 1/2 size option for this.