Crystal Mine

This type of shard mine is the second mine in this game. You can mine for crystals and or shards, but not a diamond mine, but it is a upgraded Gold Mine. And this mine mines for valuable shards to get more coins from new and improved prisoners, but they will mine more special minerals such as the Gold Mine, and getting more cells in this crystal mine will make money quick.

Mine
It is valuable and it is made of crystal shards. And it will increase profits a lot.