Sandstone

Sandstone is a solid block, crafted by placing four blocks of sand in a crafting square, in a square shape (thus, it does not require a workbench. It was added in the Beta 1.2 update on January 13th, 2011.

Placed Sandstone can be harvested with a pickaxe, though it takes a considerably long time to break even when using a diamond pickaxe. When destroyed by hand, it is slightly stronger than wood; however this yields no block for you to replace. Its unique style allows for desert-themed architecture. Sandstone can be quickly obtained in order to build a shelter and survive the first night in Survival.

When the update was first released, it was believed that spiders could not climb Sandstone walls. This has been proven false.