This is a type of materiel that is made using high temperatures. An example of a product made using this material is China.

Glass is made by melting several materials at high temperatures and is used to make China. Silica within sand is the main material that makes glass. The silica is usually combined with soda ash and limestone. These materials are melted together at a temperature of at least 1700 degree Celcius. 

Obsidian is a hard, black, and glassy, type of stone. Obsidian is a form of glass that is created naturally within the mouth of a volcano. Obsidian is formed when sand is melted during a volcanic eruption. 

Lightning can also melt sand into fulgurites. Fulgurites are slender, tubular-shaped glass formations. The lightning has to strike sand that contains a lot of silica or quartz at temperatures greater than 1800 degrees Celcius in order for fulgurites to form.