Cameras of natural materials?

[Poisson Du Jour]

Most aluminum comes from bauxite.

and certain of us are a bit obsessed with making timeless images that will keep record of our brilliant thoughts forever...

You bet we are, Keith! Skitch 'em! Now we're really banging identical wavelengths!

[Colin Corneau]

Umm, is glass natural?

PE

Yes, from lightning strikes upon sand. I've heard anecdotes that a sort of glass spike is beneath the sand, following (roughly) the contours of the bolt of electricity.

Anyway, the impulse or intention of the OP is commendable, I suppose. Logically, as has been noted, the best approach is to find a second-hand camera, since its impact has already been made and absorbed by Mother Earth, and in some infinitesimal way will reduce demand for further manufacture.

But I do hope any images made with whatever is decided upon will focus upon the natural world with the aim of preserving the environment..?