Cobblestone Blocks

Description
It is not possible to dismantle, melt, scrap, or use as a source of Combustible fuel. Hitting the block will yield 16 small stone in total.

''Temporary Note: Cobblestone mechanics have changed for Alpha 16. Cobblestone Rocks now are used to create Flagstone Blocks instead of Cobblestone Frames and, ultimately, Cobblestone Blocks.''

Upgrading

 * It can be upgraded to Concrete Blocks with 10x Concrete Mix.