But while the earthbound feature is made of limestone, a sedimentary rock, Atoko Point on the Red Planet is composed of pyroxene and feldspar, components of igneous and metamorphic rocks.

These look like the "reduction spots," also called "leopard spots," commonly seen in red sedimentary rocks on Earth. Such ...

The basalt which makes up the Giant’s causeway is an igneous rock. Sedimentary rocks are formed by small rock pieces which are transported by rivers and laid down in layers. Chalk is a ...