The hill was once an active volcano that erupted thousands of years ago and covered it with lava, creating basalt rock. Nearby is Shen Ramon (Ramon’s Tooth), a rock formed from magma that solidified underground. Through cracks in the ground’s surface, this rock later emerged to the surface, contrasting with the nearby cream-colored southern walls of the crater as a black rock with sharp edges.
The eastern part of the crater contains several vertical dykes (rock that forms in a crack in pre-existing rock). At some of them, you can find geodes (a space of a rock mass filled with a mineral) of celestine (a mineral consisting of strontium sulfate).
