Bone ash 
Bone ash is a white material produced by the calcination of bones.
Characteristics
- Typical bone ash consists of about 55.82% calcium oxide, 42.39% phosphorus pentoxide, and 1.79% water.
- The exact composition of these compounds varies depending upon the type of bones being used, but generally the formula for bone ash is Ca5(OH)(PO4)3.
- Bone ash usually has a density around 3.10 g/mL and a melting point of 1670 °C (3038 °F).
Sources: Wikipedia — Bone ash
Provisional sheet created automatically, being verified.
Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.