I made a suggestion, in the suggestions category that new types of ore be implemented into the game.
The post is here: https://forum-en.gw2archive.eu/forum/game/suggestions/Tyria-just-got-Deeper-Dig-it/first#post2573477
Please leave your feedback!
The basic idea is new types of rare ore found deep in caves and underwater caverns. This ore would be about as rare as orichalcum and would take some work to get to them as they would be populated with similarly themed monsters. Sometimes the entrance to these cave would be in caves and usually would be hard to spot. The ore would be crystalline, volcanic and some type of aquatic ore. You would use this to make similarly themed gear with flashy effects (Glow, mist, smoke water dripping, magma dripping).
If you like this idea please leave a comment on the post I linked. I only posted here to see what crafters specifically would think.
Thanks.