a chunk of salt

It is composed of coarse granules of a translucent white substance. You gather that it is salt, as it has a distinct odour and feel. Perhaps its origin is Cardolan, a region south of the Shire that is known for its salt exporting.

It is a chunk of salt.
It weighs a couple of pounds.

You identify a chunk of salt.
It is sodium chloride.
It weighs two pounds and three ounces, and it is worth about six celeb and fifty busc.
Its keywords are salt, chunk, and spice.