Talk:Dragons/@comment-24.6.108.214-20130319142402/@comment-9134334-20130319145821

Probably because onyx is considered a gem, whereas obsidian is actually a type of volcanic glass. :)

On an unrelated note, I find it interesting that both onyx and obsidian start with o... I've always associated the letter o with the color black. In fact, when I'm reading or writing, I subconsciously associate many letters with colors (e.g. a is red, e is white, i is light blue, p is darker blue, q is purple, u is brown, etc.)...

Yes, I'm weird. O_o