I'm currently on vacation, hence the short written accompaniment. – Daniel

Thanks to Amir from Israel for sharing his photographs of this small succulent. Native to the Cape Province of South Africa, “split rock” has a number of other relatives that resemble rocks or pebbles. Fred Dortort has written a tidy summary article on these “Magic Rocks” for the University of California Botanical Garden at Berkeley.

For a few other images of why this plant deserves its common name, an image search on Google for Pleiospilos nelii has a number of results.

Botany resource link: Learn more about the tropical genus of plants Peperomia at peperomia.net – “The Internet Peperomia Reference”.