laterite

It is a new soil generated in the savanna.
However, it is so hard that it cannot be removed unless it is an ice ax, and it can be obtained mainly by using an ice ax that is larger than a stone.
It is impossible to grow grass by plowing, but it can be used in various buildings.
In particular, the brick "laterite brick" using laterite has a different atmosphere from ordinary bricks.
If you have any other good ideas, please let us know in the comments.
Thank you for taking a look at my idea.