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2. Barbecue grill - Wikipedia

   en.wikipedia.org/wiki/Barbecue_grill

   Rock grates are placed directly above the burner and are designed to hold lava rock or ceramic briquettes. These materials serve a dual purpose - they protect the burner from drippings which can accelerate the deterioration of the burner, and they disperse the heat from the burner more evenly throughout the grill.

3. Fire rock - Wikipedia

   en.wikipedia.org/wiki/Fire_rock

   Fire rock is manufactured lava rock that is sold in various shapes and sizes, and is used as a medium for retaining direct heat. Fire rocks are used in natural gas fireplaces or in natural gas or propane burning fire pits. It may be used as the main fuel distributor or as padding for fire glass to go on top.

4. Fire glass - Wikipedia

   en.wikipedia.org/wiki/Fire_glass

   Fire glass (also fire pit glass, fire rocks, fire beads or lava glass) is a type of tempered glass, chunks of which are used decoratively on fireplaces. Pieces of the glass are heaped around jets of burning gas, or around liquid ethanol , in order to conceal the jets and reflect the flames. [ 1 ]

5. Scoria - Wikipedia

   en.wikipedia.org/wiki/Scoria

   Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [ 1 ] [ 2 ] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition.

6. Grate heater - Wikipedia

   en.wikipedia.org/wiki/Grate_heater

   This tubular fireplace grate heater has a large surface area heat exchanger in a compact design, with a fan or blower (fans and blowers are not the same) to multiply the effect of natural convection. This is a very basic tubular blower that sits under a grate and heats the air being pumped through it from the heat of the coals.

7. Shoshonite - Wikipedia

   en.wikipedia.org/wiki/Shoshonite

   File:Shoshonite lava flows on South Table Mountain, Colorado. Shoshonite is a type of igneous rock.More specifically, it is a potassium-rich variety of basaltic trachyandesite, [1] composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass.