crumb (n): a very small piece of food, especially of bread or cake, that has fallen off a larger piece
She stood up and brushed the crumbs from her sweater.
ok, now I want to change the definition a little bit. That is:
a very small piece of glass that has fallen off a larger piece
do we say "glass crumb" as just as we often say "food crumb"? If not, what is the word to say?
also other kinds of materials? "wood crumb" or "stone crumb"?