Interesting shot and topic. Interesting geology sparks interesting finds I suppose. And some finds like fossils??? Really, really, really should pop up in conversation! ...if you get my gist!
Yessss, when i was in Lanzarote (Canary islands)
not far from Morocco actually,
we found similar ones except inside
they were green, they were called "Olivines"
and they are "géodes".
Love them...do you have an extra one for me? LOL
(stones are the only thing i collect because they fascinate me ;)