What's this soil made of?

[WaterTight]

 

[Last Plumber]

Asbestos.
Looks like it on photo anyway.

 

[ShaunCorbs]

I would say ab as well

 

[Harvest Fields]

Same here. Asbestos probably.

 

[WaterTight]

Lovely. Thanks

 

[Ric2013]

Oh dear. Let's hope it's chrysotile, at least.

Hope you didn't use a vacuum to clear up, as, unless it's made for hazardous dusts, then you really should bin it now else it will contaminate every other house you use it in.

 

[Ric2013]

To be honest, I'd have said asbestos from the first photo. Personally think all construction workers should have to do asbestos awareness.