At what temperature does sand turn into glass?

Also called quartz sand, silica sand is the primary ingredient in making glass. Glass is made from liquid sand. You can make glass by heating ordinary sand. To melt sand, Sodium Carbonate and Calcium Oxide are added to reduce the melting point of the mixture and then it is melted. Sand melts at the incredibly high temperature of (3090°F/ 1698°C).

To reach high enough temperatures to melt sand you will need a kiln (aka furnace) and a good fuel source. Charcoal when supplied with forced air will produce the required temperatures.

After this process is completed, the artists will mold and bend the glass to create the functional purpose. This process can vary in range, but generally the industrial side is around 7-10 minutes, while the artistic side can be 1-2 days.

There is another way to make glass without a kiln, Lightning. When it hits a sandy beach high in silica or quartz and the temperature goes beyond 1698° Celsius, or 3090° F degrees the lighting can fuse the sand into silica glass. The blast of a billion Joules radiates through the ground making fulgurite — hollow, glass-lined tubes with a sandy outside. Which produces "Petrified lightning."