Short Answer: Emerald (Block/Ore/Item) Long Answer: Ok, I'm going to have some fun here. Obviously, Diamond is very useful. You can make very strong tools with it, and it is pretty rare. But one could argue that Wood is more valuable, since diamond would be useles without sticks to make the tools. But I say emerald, since they can be used to trade with villagers, and can get you virtually anything. Now emerald is the most valuable, but what about the rarest block? I would say the rarest block that can still be found in world generation is the mob spawner. Specifically, the silverfish spawner, since there is only one per game (At the end portal). BTY this is my OPINION it may not be exactly statistically correct, but I'm sure its pretty close.
Bedrock, Block of Diamond
The netherite block,the diamond block and the iron bock
Diamond
right now in 1.5.2 there are 3 heres the a list .block of redstone .block of quartz .dropper
In Minecraft, the gold block is data value 41.
In all technicality, the most common block in Minecraft is Air. In terms of solid blocks, it's stone. There might be a few dirt blocks in the way, but digging around mostly yields stone.
What is the strongest block in minecraft
A minecraft block is 1 Meter to scale in real life.
The hardest block in Minecraft is bedrock. It is completely unbreakable unless on creative mode.
There is no command block in minecraft. If you go to the Minecraft WiKi it will have all the information you need for anything in the game.
Minecraft is a block related game. The developers never intended for their to be circles in minecraft.
spawn it in
There are single player mods that enable this as a command. But most are for multiplayer if you are searching the plugin: WorldEdit is the most chosen
To place a block in Minecraft, just right click. Hold down left click to break it.