Stone riddles

Exploration Stage: Abandoned Factory
From: Mr. Black
Description: The killer is not an expert crystal worker, so he must have brought in extra materials to accomplish his goal. I feel we are one step closer to the key to solving the mystery. We just have to work a little harder and find the crystal that the killer used. Let's search the area!
Completed: Like I said. Proper leadership produces results. You found a collector's backpack filled with crystals identical to the defective one. I ran it through the identifier, and it turns out it's amazonite. But it is strange. This is not an ore used to make weapons or devices.