This came from a laboratory that shut down that did testing with carbon nanotubes.  I don't know anything about it other than the barrel is marked "Blended B4C".  With the barrel it weighs about 70 pounds and so I would guess the weight of the powder to be about 60 pounds.  I can send you a small sample if you would like to analyze it before purchasing.  

wf floor

fdk 80323238

81126248