Headcanon: Crystal Pony

Thank to G5, earth ponies having earth-based magic is now an acceptable canon. So here my headcanon on how the crystal ponies work.

Okay, so you all know how gem stone being a good magic conductor seem to be something most writer agree upon? Well, gem stone are mostly found under the earth, and crystal ponies are basically earth ponies that decide exploit this. Focusing their craft on gem stone and other mineral until they evolve into a whole new pony tribe.

In fact, I have it that they could have become the most technology advance civilization on ponyworld... and then Sombra happened.

As far as I know, normal crystal ponies don't have wings or horn, and if they do I could headcanon those out.