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Minecraft resource gathering/Concrete
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Concrete cannot be found naturally in Minecraft. The only way to obtain it is to make it. Here's how.
Concrete powder
There are only three ingredients to craft Concrete Powder: 4 Sand, 4 Gravel, and any color of dye.
Turning it into concrete
You need to put the concrete powder in water to get concrete.
And you're done!