Concrete Powder

Concrete powder is a solid block which comes in the 16 regular dye colors. Like sand and gravel, concrete powder is affected by gravity.

Breaking
Concrete powder can be mined with any tool or by hand, but using a shovel is the quickest method.

Usage
Concrete powder will fall when there is a non-solid block beneath it. If it falls on a player or mob, the player or mob will suffocate.

Creating concrete
If a concrete powder block comes into contact with water, it will solidify into a block of concrete. Specifically, the block has to fall into or be placed in a space that water occupied, or the water has to flow into it, whether from the side or above. It will also solidify if it's adjacent to water that isn't flowing into it. The exception to this is that it will remain concrete powder if an isolated block of water with nowhere to flow is used. Rain also has no effect on concrete powder.