From Minecraft Wiki
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Bones can be used to make Bone Meal, which serves two main purposes:
- As a fertilizer, which grows many plants to their fully mature state after 2-5 uses.
- As a crafting ingredient in Wool Dyes. It can also make sheep white.
 As a crafting material
|1.2||Added bones, which can be crafted into Bone Meal.|
|1.4||Bones can now be used to tame Wolves.|
|1.3.1||12w21a||Bones can now be found within Desert Temples, allowing bones to be obtainable on peaceful mode.|
|1.4.2||12w36a||The newly introduced mob, the Wither Skeleton, also drops bones.|
|1.7||13w36a||Bones can be more easily obtained in peaceful mode by fishing this as a "junk" item.|
- As with Sticks and Blaze Rods, Bones are wielded as a tool instead of an item.
- The bone appears to be the femur, the humerus, or the tibia of a human, however is more likely to be the femur, because the humerus and tibia are slightly curved. This does not rule out the possibility of it being either of those two, however.