Rare fossilised tusk

Rare fossilised tusk
Released							7 September 2017 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							No
Equipable							No
Stackable							No
Noteable							No
Options							Drop
Examine							This fossilised tusk belongs in a museum!
Values
Value							1 coin
High alch							0 coins
Low alch							0 coins
Weight							0.907 kg
Advanced data
Item ID							21620
Link							MOID

A rare fossilised tusk is a fossil that can be obtained by cleaning an unidentified rare fossil on the fossil cleaning bench east of the Museum Camp on Fossil Island.

They can be used at the mycelium pool to be calcified into a rare enriched bone via a chemical process that uses pyrophosphite and calcite. Whilst the reaction is happening in the pool, players must add additional pyrophosphite and calcite to maintain the chemical process, and pop bobbing fossils that surface around the pool, otherwise the fossils will become too exposed to air and dissolve. Once completed, players can open the sluice gate behind the Ancient Shroom, and check the rinsing pool to obtain the enriched bones. They are then used on the easternmost strange machine in the House on the Hill for 2,500 Prayer experience.

Also, they can be traded to the Fossil Collector in exchange for 500 numulites.

v t e Fossil Island fossils
Small	Limbs Spine Ribs Pelvis Skull
Medium	Limbs Spine Ribs Pelvis Skull
Large	Limbs Spine Ribs Pelvis Skull
Rare	Limbs Spine Ribs Pelvis Skull Tusk
Plant	Roots Stump Branch Leaf Mushroom
Unidentified	Small Medium Large Rare
Related	Enriched bones Small Medium Large Rare Fossil Collector Ancient wyvern shield Numulites Varrock Museum Mycelium pool Strange Machine