An abrasion sample taken from a destroyed Thargoid Titan's hardened debris.
— In-Game Description
Bone Fragments is a type of Commodity that can be obtained from shooting Bone Structure Fragments in Thargoid Titan graveyards and picking up the dropped Bone Fragments.
The Bone Fragments is corrosive to ship modules, and can only be safely transported using a Corrosion Resistant Cargo Rack.
A photo of a Bone Structure Fragment next to a Cobra MK V.