In response to the commenter who noted issues with the mining laser, and followed up with commenting that the difficulty is getting it back to your base: bring an Argy. They get 50% weight reduction on Chrystal. I believe obsidian as well, but I would need to verify that, just to be safe.take you best Argy, carry your best anky, arrive at location, load up anky, move Crystal to Argy, return to base. You could even bring multiple argies and bring even more back.