its not a rock but it is the rarest without a mod is emerald ore
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there are no horses
Emerald I think
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The rarest ore in Minecraft is emerald ore. Emerald ore can only be found in extreme hills biomes and only spawn as an individual rather than in veins. Emerald ore can be mined with an iron or diamond pickaxe.
Technically, it is the giant, because it cannot be spawned in creative or survival. You require a 3rd party program to spawn the giant. The rarest mob that is spawned, is the enderdragon. There is only 1 in The End.