Our lava rock is the highest quality in the industry, it is very clean without all the dust and dirt that most companies sell. Our Tumbled Lava Stones are manufactured to give you that more rustic look in a stone that is fire rated and perfectly safe in fire features. Our black and white sand are perfect for using as a fill under a fireplace burner to raise the level of your glass without having to purchase so much glass. NEVER use sand in an outdoor fire pit. A lot of contractors want to use sand as a fill, but over time, sand will compact and soon, your fireglass will sink with the sand and your fire pit burner will be exposed. Always use lava rock as a fill since it won't compact.