Advice needed for choosing materials

I'd like to get some advice for transparent material,
they need to be machinable(I need to drill some small holes) and also
hard(modulus should be > 20GPa).
I have tried some plastics but they are not stiff enough, and I am
afraid that general glass is too brittle. since later I need to apply
some force on it(about 20MPa).
Thanks!
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Henry
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Henry

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