I'm stuck yet again in POA. This time, I'm looking for the fourth nanoxite stone. I've looked through the posts, and most of them deal with verna's keycard. Well, I've got that and get the stone from the mad scientist. I got whatever the trapped miner gave me (I can't remember wether it was a shard or a stone.) I also got the stone from Cortez. I have 3 stones total.

My Inventory (I must have HUGE pockets):

3 Peryolitium Shards
Scrap of Paper
Small Key
Crank
Leather Vest
Leather Briefcase
I.D. Card
Iron Key
Metal Rod
Pet Snacks
Metal Briefcase
Passcard (CQ10001)
Silver Key
Pickaxe
Matches
Employment Papers
Passcard (CQ20024)
Gold Key
Sledge Hammer
Washcloth
ISO Access Form
Passcard (CQ30021)
Peryolitium Key
Wrench
Round Pot
TSP Manual
Passcard (CQ60537)
Vault Key
Noise Filter Headset
Small Mirror
Violations Report
Supply Room Card
Dragon Key
Knife
Sleeping Pills
Experimental Results Papers
Mine Access Card
Crowbar
ISO Energy Pulse Gun
Rock
Beetle Analysis Papers
OSA Card
Light Tube
Tranquilizer Gun
Tranquilizer Spray
Peryolitium Shell Diagrams
Izacladia Access Card
Radio Receiver
Military Uniform
ISO Accident Report
Business Card
Fire Extinguisher
ISO Officer's Cap

I would be grateful for any help you can give me.