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2. 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] It is an alternative to ceramic and stone ...

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. Obsidian - Wikipedia

   en.wikipedia.org/wiki/Obsidian

   Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminum, sodium, and potassium.

5. Volcanic glass - Wikipedia

   en.wikipedia.org/wiki/Volcanic_glass

   Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the closely packed, highly ordered array of a crystal and the highly disordered array of liquid. [1] Volcanic glass may refer to the interstitial material, or matrix, in an aphanitic (fine ...

6. Tachylite - Wikipedia

   en.wikipedia.org/wiki/Tachylite

   Tachylite (/ ˈtækəlaɪt / TAK-ə-lyte; also spelled tachylyte) is a form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt. It is a type of mafic igneous rock that is decomposable by acids and readily fusible. [citation needed] The color is a black or dark-brown, and it has a greasy-looking ...

7. Fire brick - Wikipedia

   en.wikipedia.org/wiki/Fire_brick

   Fire brick. Refractory bricks in a torpedo car used for hauling molten iron. A fire brick, firebrick, fireclay brick, or refractory brick is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal ...