In the movies, all the Monoliths are black, extremely flat, non-reflec... - dofaq.co
monolith (space odyssey)

In the movies, all the Monoliths are black, extremely flat, non-reflec...

 wikipedia - 03 Dec 2020
In the movies, all the Monoliths are black, extremely flat, non-reflective rectangular solids. In the first novel, the monolith on the African savannah was transparent and "it was not easy to see except when the morning sun glinted on its edges", but became less transparent when active and was described as a crystal. Also, the final monolith is described as a transparent crystal that becomes less transparent when active.

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