Fire Pit Lava Rocks in 10 lb Bags

American Fire Glass
Part #: LAVA


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Product Description
Product Reviews

Fire Pit Lava Rocks in 10 lb Bags

Lava rocks provide a rustic, earthy aesthetic, yet sits very well in both contemporary and traditional settings alike!

Naturally occurring, it is formed as volcanic magma rises to the surface, cools, and releases gases which gives these rocks their coarse surface. Because they are volcanic, they can withstand extremely high temperatures without sustaining any damage or crumbling.

PLEASE NOTE: The lava rock varies in color from brown to black, this is normal.

American Fire Glass meticulously processes, sifts, sorts, and then hand-packs the 10 lb bags, ensuring the highest standards of quality. Look no further, we supply the best lava rock for gas fire pits.

close-up of lava rock

Close up of XL Lava Rock


Available in three sizes – Small, Medium, and Extra Large.


Measures on average 1/8″ – 1/2″


Measures on average 1/2″ – 1″

Extra Large

Measures on average 3″ – 6″

Due to the chunk size of the Extra Large option, there may only be a few pieces per bag. The Bag however will still weigh 10lbs.

We recommend using the smaller sizes as a base for the Extra Large Sized Rock!

Small Size Lava Rock for Fire Pits and FireplacesSmall Lava Rock

Medium Size Lava Rock for Fire pits and Fireplaces

Medium Lava Rock

XXL Lava Rock for Fire Pits and Fireplaces

Extra Large Lava Rock

How much do I need?

The easiest way to find out is by using our Fire Glass & Lava Rock Calculators. You can find the link at the bottom of the page. Measure your fire pit burn area in accordance with the detailed instructions, and input the data into the calculator. The result will provide you with the quantity (lbs) required.

Make sure you set the calculator for lava rock! As a rule of thumb, it is twice the volume per pound as fire glass. So you do not want to end up buying double your needs!

Yet another great reason to use it as a filler under your fire glass or Lava Stones, it is easier on the budget!

How to use Lava Rock

It may be used on its own in a fireplace or fire pit but may also be used as a base or filler for ornaments or other media such as Fire Glass or Fire Stones.

Whichever way they are used, the resulting effect is truly fascinating.

The best part is that lava rocks require very little maintenance! See our article demonstrating how to use fire pit rocks.

When used with an American Fire Glass fire pit burner, their recommendation is pouring a minimum depth of two inches over your burner, enabling the gas to permeate evenly throughout the fire media.

With other brands you will find their recommendations for fire media depth in the fire pit Installation Manual or User Manual.

White Stone Balls on lava rock base

White Fire Stone Balls on a bed of lava rock 

Used as a filler

Due to being the most economical fire media option, it is the perfect choice for use in large areas. But it will also help keep the costs down when used with smaller fire pit pans.

Cover the burner with the filler and then add a layer of fire glass for a splash of color or sparkle creating a truly spectacular look that will instantly become the focal point of your home.

A cross section view of the gas flow through a fire pit burner and up through a lava rock base layer and fire glass topping

Used as a filler 

Prop 65Warning: This product can expose you to chemicals including LEAD AND LEAD COMPOUNDS, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

Customer Reviews

Based on 4 reviews
Sebastien Lahaie

Great product and delivery

Chad Rhoton
Great Product

Love this Lava Rock highly recommend

Robin Murphy
Great Supplier with Technical Support

You might say why do I need support when buying fire pit supplies? There is a science to it and this guy knows his stuff! He will call you back promptly and advise you as to what you need. You don't get this kind of info at the patio store. The shipments are prompt and affordable.


Had a great experience with working with The Magic of Fire. Shipped quickly and just as described.