Harmonised Rocks

Harmonised Rocks are a special type of Mining rock that were meant to apear in Prifddinas in the Trahaearn Clan area, but have failed to appear due to a glitch that Jagex has yet to fix but has been made aware of, [|as seen in this forum post]. The requirements for mining harmonised rocks are listed as 77 for Harmonised Coal, 84 for Harmonised Mithril, 89 for Harmonised Adamantite, and 95 for Harmonised Runite.