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Hi everyone, thanks for your answer.
The reason I decide to go with marble are:
1- I saw a telescope with a Carrara marble primary mirror and I have to admit that the image are not bad at all.
2- I have already a piece of marble that comes from the Pilbara; it is probably the most expensive marble available and the consistency reminds me more like an obsidian stone; if I hit two pieces together the sound is quite high compare with a Carrara marble; in my bathroom the reflection of the top of this marble is quite amazing.
3 - In the beginning I was searching for a glass blank but I had some trouble find one of the size 16inches and then I was thinking of the problem of aluminizing the final product
I was looking also at the refractive index of a general glass and marble and I would say that in a "good range" of wave lenght are comparable.
So what I have is basically this piece of marble of 495x403x30mm that I am planning to machine with my cnc.
I machine many piece of marble doing relief and incision and never had problems so I am thinking to have a go.
I am still thinking as I will proceed to smooth the surface to the final result.
thanks for the moment and please feel free to add any of your thoughts.
V.
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