Concrete

Concrete is a solid block which comes in the 16 regular dye colors.

Hardening concrete powder
Concrete can be obtained when a block of concrete powder comes in contact with water. Rain, particles, cauldrons, etc. cannot affect concrete powder.

Breaking
Concrete requires a pickaxe to be mined. When mined without a pickaxe, it will drop nothing.

Usage
Concrete's bright and solid colors makes it useful for decoration. It has more pronounced colors than stained hardened clay, and is not flammable like wool.

As a building material, its hardness is slightly higher than stone, but its blast resistance is significantly lower.