Which preposition to use with potsherds

of Occurrences 4%

In the first two which we examined we found nothing; the third contained several broken coffins, some skulls, and potsherds of glazed and crudely painted earthenware, of which, however, it was impossible to find two pieces that belonged to each other.

on Occurrences 1%

The jars, having been emptied into large vats, are carefully scraped and then smashed so as to prevent scavengers from obtaining opium from them, and there is a mountain of potsherds on the river bank beside the factory.

with Occurrences 1%

And he took a potsherd with which to scrape himself; and he sat among the ashes.

Which preposition to use with  potsherds