Adamantite ore is an item which may be obtained from an adamantite rock by players with level 70 in the mining skill or higher. Doing so grants 90 experience when successful. It can be smelted with six pieces of coal to create an adamantite bar, granting 37.5 smithing experience.
For a list of adamantite rock locations, see adamantite rock locations.
Adamantite ore can be thieved at level 72 thieving or higher from the Paladin Chest on the the top of the East Ardougne castle.