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.

The shell most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was Dentalium, one of several species of tusk shell or scaphopod.[citation needed] The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches.[citation needed]