Synthetic Diatomacious earth!
Will wonders never cease.
Yeah, the originals were mined from what used to be sea bed deposits but the critter's cousins are still alive and well.

We were always told never to use the O2 from the Oxy-Acetylene set-up to clean up the work space (blow down) because it would ignite any oil it went across.

I heard about, but can't confirm, a large spill of LOX during a traffic accident involving a tank truck. Supposedly it caused the asphalt to liquify. A policeman standing on the asphalt supposedly sank into it and had his leg was damaged from the cryogenic affects. Probably an urban legend.