pre

that is a thermal conductivity chart you should use a
r value chart.

that would give insulation values of the different materials.

heres one

http://www.coloradoenergy.org/procorner/stuff/r-values.htm

and rock will absorb and hold heat or cold so you would have a great place to live inside a cave but you could freeze or heat to death before long without a insulating barrier between you and the rock.

a rock cave can actually drain your body heat away from you quickly , but a 2" sheet of styrofoam on the walls with a few inch air gap will pretty much insulate you from the cold or heat of the rock or dirt or block.


3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.