You may call it stone, they named it rice
Companyganj, sylhet located at the eastern border of Bangladesh.where people dig stone/gravels/pabbles from the heart of the river named Utma.They started digging when the very first sun light penetrates the earth and ended up when sun goes down,after all the hardworking day they earn just 160-180 BDT(near about 2$), and they run their life by that way for life long.
So, i named those stone as rice, what they feed by
Abir shAmippo, Bangladesh, Dinajpur