XX-Large Black Lava Rock (3" - 9") - 40 Pounds 
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What Is Lava Rock & Why It Belongs in Your Fire Feature
Lava rock is a naturally formed volcanic stone trusted in fire features for decades. Its porous structure promotes airflow and heat distribution while adding rustic beauty to both traditional and modern fire pit designs.
You can use lava rock in:
- Gas fire pits and fireplaces
- Outdoor planters and landscaping features
- Rustic accents and large decorative rock installations
Unlike ceramic logs or synthetic alternatives, lava rock resists cracking and discoloration under extreme heat. It’s safe, durable, and made for a clean, natural burn—indoors or out.
XXL Lava Rock – Oversized Texture for Maximum Impact
Our XXL Lava Rock ranges from 3" to 9" in diameter, making it ideal as a dramatic top layer for large fire features. It must be paired with a base of Small or Medium lava rock to ensure optimal burner performance and flame coverage.
Compared to smaller lava rocks, the XXL size:
- Creates bold visual impact with rugged, natural texture
- Enhances flame contrast with deep brown and black hues
- Complements large fire bowls and outdoor settings
Key Features
- Hand-selected natural volcanic stone in rich earth tones
- Rated for high-heat applications
- Not suitable for use as a base filler
- Responsibly sourced, sifted, and packaged in the USA
- Available in 40 lb bags—perfect for dramatic top layer finishes
Built to Last & Fire-Safe
Formed by nature and perfected for fire features, our lava rocks handle extreme heat without breaking down or crumbling. Their porous surface evenly disperses heat while protecting burner components below—making them safe, efficient, and ideal for commercial installations.
Bold Design for Larger Outdoor Spaces
Whether you're building a luxury patio fire pit or an oversized fire bowl, XXL lava rock delivers a rugged, high-impact finish. These 3" to 9" volcanic stones are made for top layer use, adding dramatic texture, natural contrast, and elevated style to any outdoor fire feature. Pair with smaller lava rock underneath for proper airflow and peak burner performance.
Hand-Processed in California
We don’t cut corners. Each bag of lava rock is responsibly sourced, sorted, and packaged at our California facility to ensure quality, consistency, and durability. It's our way of guaranteeing the best results—every time you light the flame.
American Fire Products – Trusted by Thousands, Chosen for a Reason
With over 5,000 retail partners across North America, our lava rock is one of the most widely used and trusted fire pit media on the market. Every bag is hand-processed and inspected for quality, ensuring exceptional performance and safety right out of the box.
We take pride in doing things the right way. From sourcing and sorting to shipping and service, our team is dedicated to delivering premium volcanic rock that looks great, burns clean, and lasts season after season.
Experience the timeless beauty and lasting performance of natural lava rock. Your fire feature deserves the best.
Fire Glass Calculator
Frequently Asked Questions
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Lava Rocks, Lite Stones & Balls
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How much Lava Rock do I need for my fire feature?
Use our handy lava rock calculator to determine how much lava rock you or your clients will need for your fire feature.
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Can I use lava rock with fire glass?
Yes! using small lava rock as a base layer is very cost effective. We recommend using small lava rock as a base to completely cover the burner and then adding 2" of fire glass depth on top of that.
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How many lava rocks come in a 10 pound bag?
All our 10 pound bags of lava rocks are based off of weight and not quantity of rocks. The number of rocks will very slightly from bag to bag.
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How many tumbled lava stones come in a 10 pound bag?
All our 10 pound bags of tumbled lava stones are based off of weight and not quantity of stones. The number of stones will very slightly from bag to bag.
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What are your Lite Stones made of?
Lite Stones and Lite Stone Balls are made of a lightweight ceramic fiber material.
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What is the proper media base for lite stones and lite stone balls?
Use small black lava rock as a base to properly insulate the burner. The stones/balls can be placed on top and rest in the flames like a decorative topping. The firepit should be fully functional with just the lava rock.
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Can I use all Medium or XXL Lava for my firepit?
We recommend using a base layer of Small Black Lava to insulate the burner and then you can use the larger pieces as a decorative topping.
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Which tab should I use in your calculator for Tumbled Lava Stone?
Tumbled lava rocks have similar density to fire glass.
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Do I cover the burner with fire glass?
YES, a burner should NEVER be used unless it is completely covered. A 1/4" diameter media base is strongly recommended to cover the burner before applying the final topping. The media should cover the burner by about 1/2" to 1" before the final topping is added. Our small lava rock works best. Operating a burner without proper coverage can cause warpage and possible permanent damage to the burner and burner pan. This will also void the warranty on the product.
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Are these products safe for high heat?
Absolutely. All of our lava rocks, Lite Stones, and Lite Stone Balls are rated for use in fire pits and fireplaces. Just make sure they are completely dry before lighting to avoid any popping or cracking.
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Do I need to replace lava rock over time?
Yes. Lava rock can deteriorate after a few seasons due to weather and heat. Check it annually and replace as needed for best performance.
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Don’t see your question listed?
Please contact [email protected] or call 888-264-1017 and one of our representatives will gladly assist you.
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