Bedrock is the most common but it is not obtainable in survival mode. Next to bedrock there is obsidian which can be made with water and lava so there is basically an infinite amount. Obsidian is explosive resistant and lava resistant. You need a diamond pickaxe to mine obsidian and it can take some time.
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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.
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The hardest block in Minecraft is bedrock. It is completely unbreakable unless on creative mode.
Minecraft is a block related game. The developers never intended for their to be circles in minecraft.
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