On the east coast of North America, Indigenous peoples of the Iroquois Confederacy and Algonquian tribes, such as the Shinnecock tribe, ground beads called wampum, which were cut from the purple part of the shell of the marine bivalve Mercenaria mercenaria, more commonly known as the hard clam or quahog.[2] White beads were cut from the white part of the quahog or whelk shells. Iroquois peoples strung these shells on string in lengths, or wove them in belts.