Crystal deposits are found in the Cold Caverns. There were findings of veins closely to the Cold Caverns but never in greater distance. It can be Dug-up with a Buildgun MK2, Ore Extractors and by Trencher-Extractors.
Crystal Deposits are used in a variety of Recipies. Read the Following Sides to know where.
Cold Caverns, -200 to -280
1st Stage of Extraction:
Build Gun MK2
2nd Stage of Extraction:
Ore Extractor Fitted with "Steel Cutterhead" or harder.