Crafted from quartz sand and tempered to withstand 1112°F / 600°C, this 20 lb. bag of 1/2 in. cobalt blue fire glass turns a propane or natural gas fire pit into the centerpiece of the patio, catching every flicker and bouncing it back as deep sapphire light. The reflective crushed pieces hide the burner pan and gas lines underneath, replacing dull lava rock or fire wood with a clean, modern look that pairs with both stone fire pit tables and built-in outdoor fireplaces. Fill the burner to a 2 in. to 4 in. depth for full coverage, and you'll get the same warm flame with no smoke, no chemical smell, and no ash to sweep out the next morning. At 20 lb., the bag is easy to lift and pour into the pit, and the crushed glass redistributes evenly without sharp edges. Worried about cleaning? A simple rinse with a 1:1 water-and-vinegar mix brings the glass back to its original shine, and full air-drying before the next light keeps moisture from causing cracks. Whether you're hosting late-summer dinners on the deck or warming up an early-spring garden party, the cobalt blue glow makes every gathering feel a little more memorable.