We already had some discussion here but I think this is time to talk it over again.
Loam itself - is just some kind of a soil (is is a mixture of sand, clay and silt actually, but never mind):
  
(If make a texture from it it would look something like this:)

In nature it is not found in a form of chunks (balls, pieces, clots etc...). But it is sometimes used for house construction and can be shaped manually to some kind of bricks:

So the question is obvious: how should we actually represent (and implement) it?