Harmonised rocks

Harmonised rocks are a special type of Mining rock that were meant to appear 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 as seen in this 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.