Abstract
The identity and proportions of heavy minerals, and in particular rutile and ilmenite, have been determined in a representative collection of beach and dune sands from Florida. The heavy minerals were concentrated by means of heavy solutions, separated into several fractions of varying magnetic properties with a Franz iso-dynamic separator, and proportion determined by means of grain counts. Sixteen minerals were identified, about eight of these (enstatite, epidote, garnet, ilmenite, rutile, kyanite, staurolite and zircon) being present in essential amounts. The so-called ilmenite of these sands proves to be an essentially amorphous material with its iron in the ferric state and hence it is chemically, but seemingly not structurally analogous to arizonite. The size distribution of the quartz sand, and heavy minerals is described in two representative occurrences.
