I pulled the full files from twatter. Not sure if the xif data is still in them or not. I have to get back on the road. If some camera fags could get us an estimate of dimensions, we can compute volume and take the guy at his word that those weigh 3kg to at least see if that's in the ballpark for Uranium's density. Source would appear to be from Britain's nuclear program back in 68, if that date is anything to be believed. I find the apparent soldering of lettering to the block intriguing. It could be a different metal and there is also an apparent oxide layer that is worth looking into for chemfags.
I've still got to get back to western MO and am in Kentucky at the moment. I have to put my phone down and get back to the driving. Godspeed, faggots.