In the second post, you were questioning wether you can mine Pixie Plates.
I have gotten 2 Pixie Plates from mining glowing rocks, so I can confirm that they appear there, too.
I can't link to a screenshot of me mining it because I got them last week before reading this, but here is a pic of them in my inventory.
http://oi59.tinypic.com/4ic1zs.jpg