This fragment is too small to identify the type of bone it once formed a part of. Some lands prohibit their use outright, others require prior ablution with holy water.
Bone Fragment is a loot that can be dropped from Fideliant, Grave Lord, Lost Soul, Skeleton, Skull Defender, and Skull Warrior, or stolen/poached from Skeleton, Skull Defender, and Skull Warrior. Five are required to create the Cypress Pole in the Bazaar. It sells for 193 gil.
Fragments of shattered bone. Douse with holy water before use, or suffer dire consequences.
Bone Chips is a low-ranked Small Bone that can be Scavenged from Inscrutable Bones on Zephyr, the Windward Isles or bought at the Sky Saloon in Chapter 4 for 150 gil. It can be used to craft Mythril Blade, Gaia Rod, and Storm Lance.
The fragmented shards of monster bones. Touch them lightly and they will crumble.