Talk:Opal Dragon/@comment-5535164-20121001195309

Opal is a form of amorphous silica related to quartz so the Crystal dragon is a very good possibility. Opals are 3-21% water, so a water hybrid is possible. They can be found in sandstone (the reason people are saying Sandstorm dragon), Basalt (Lava dragon), and Marl or Mudstone (Mud dragon).

My thoughts are Crystal + Rain/Mud or Lava + Rain/Mud.

So far, no opposite or uncommon hybrid dragon has been used to create the Gem dragons. Only traditional hybrids have been used. The only Metal Hybrid used so far has been the Chrome because, chronium is what gives Rubies their color (says so in the description).