Amazon.com: lava rock landscaping. Best Sellers Gift Ideas New Releases Whole Foods Today's Deals AmazonBasics Coupons Gift Cards Customer Service Free Shipping Shopper Toolkit Registry Sell. Decorative Landscaping Rocks or Gas Fire Pits Rocks, 3/4" (.75") (40 Lbs, Black Lava Rock) 3.7 out of 5 stars 14. Amazon.com: lava rock landscaping Please note: You are currently browsing img black lava rock in landscaping design and ideas that is 2848x3413px in size. This image is listed in lava rock landscaping ideas category. Amazoncom lava rock landscaping, 2848x3413 in 363.45 KB.