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IIIF Iron Meteorites
Description: Most members of the small IIIF group are medium to fine octahedrites with a relatively low nickel content. With regards to their elemental compositions, they display high values for chromium, and low values for germanium, cobalt, and phosphorus. Consequently, IIIF irons rarely contain inclusions of phosphides (e.g. schreibersite), and troilite is equally rare or absent.
Formation history & Origin: The chemical composition suggest the formation of the IIIF iron meteorites occurred in the core of a small, differentiated asteroid.
Members: This small group counts just eight members. The iron meteorites of Klamath Falls, Nelson County, and St. Genevieve County are typical, although not famous, members of the IIIF group.