A window. Or what you may refer to is what is glass made of. Glass = Sand.
Usually glass.
i don't like you
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Window Glass
window glass
window glass
Window glasses are made by mixing white sand, unpurified pearlash, and wood ashes. These materials are sifted, burnt, and placed in a mold to make window glass.
Glass is the ideal material for a window. It's strong and easy to make, and you can see through it. High-quality glass can also be used in binoculars, telescopes and spectacles.
If you know who made it the factory should be able to supply. If it is stationary and double paned then most glass companies should be able to supply a new glass. Should be able to install new glass in old window even if the frame in solid around glass. There is always a way to replace any window glass.
I understand the casket was lead-lined, with a glass viewing window. This was discussed during the televised coverage of the funeral. Addition: Diana's coffin was made of oak with an inner metal liner made of lead. The liner had a glass viewing window.
The first glass window was made in the Roman times! == ==