title: High-purity calcium carbonate in freshwater clam shell.
abstract: The calcium carbonate in freshwater clam shells is simlilar in purity to that designated reagent grade. A simple reprecipitation of the shell extract results in a product having less Sr and Mg than reagent grade CaCO(3). Clams are harvested commercially, and discarded shells are a high-quality raw material for the production of CaCO(3).
authors.forename: D J
authors.initials: DJ
authors.lastname: Nelson
authors.forename: T C
authors.initials: TC
authors.lastname: Rains
authors.forename: J A
authors.initials: JA
authors.lastname: Norris