Peter,
I would simply describe it as you did, then add Gunnar's and Jon's comments:
Attic Insulation:
Originally Posted by
Peter Wigle
Combination of wood shavings, vermiculite (if it can be white), and some hard bits of stuff which looks like plaster mud or stone/mineral. Is there a name for this mixture, or is it just some random by-product,
Originally Posted by
Gunnar Alquist
Probably not enough insulation anyway.
Originally Posted by
Jon Randolph
Possibly asbestos containing material.
Pretty much describes it, advises it is likely not of much use, and warns as to what *it might* contain.
The only other thing I would add is "Potentially a fire hazard." When talking with your client, if you tested it to see if it ignites, you could say 'Makes good kindling for starting fires. I tested some outside, want to see it go up in flames?'
Did you try to ignite some (not in the attic, of course, but outside)?