Stellafane 2008 - Al-Paslow
Here is a very large piece of ceramic glass know as Cervit. This glass has a very low expansion and contraction rate and is an excellent choice for a telescope mirror. Since this disk has an odd shape one would need to cut out smaller diameter round disks to be made into useful telescope mirror blanks.

Here is a very large piece of ceramic glass know as Cervit. This glass has a very low expansion and contraction rate and is an excellent choice for a telescope mirror. Since this disk has an odd shape one would need to cut out smaller diameter round disks to be made into useful telescope mirror blanks.

Cervitglass