Can't say.
Looks like you could easily replicate something like that though, with the thin, clear plastic light paneling, or shower door material sold by TAP Plastics. It's made of acrylic.
Cut to size/shape, paint underneath, add banks, and perhaps a little white water stippling on top, if desired, you are done.
Other materials would work too, but you need more modeling skill and time for those. The above is dead simple, once you cut to size and shape. Razor knives, saws, files, sandpaper, and/or a Dremel too will be very useful for this.
The latter especially for final shaping and smoothing.
Don't forget to wear goggles and a face mask/respirator to avoid breathing in the particles/dust, and to keep from getting it in your eyes.