Quartz fiber

[5] For optical fibers, germanium and phosphorus can be added to increase the refractive index.

[6][7] A single quartz fiber can have a tensile strength of 800 kilopounds per square inch (5,500 MPa).

[2] It is used mainly for producing composite materials (due to having higher stability compared to glass fiber) and in electrical applications where thermal resistance and dielectric properties are important.

This is due to a quartz fiber having the ability to transport data at a speed of 1 terabit per second,[12][13] and having a transmission loss of 1 decibel per kilometer.

[14] Similar to how fiberglass can be made, quartz fiber can be used to make composite materials by combining with a resin.