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Meteoritic Iron Phosphide
Author(s) -
Buddhue John Davis
Publication year - 1938
Publication title -
contributions of the society for research on meteorites
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0096-2813
DOI - 10.1111/j.1945-5100.1938.tb00184.x
Subject(s) - phosphide , meteorite , nickel , mineralogy , geology , cobalt , materials science , metallurgy , physics , astronomy
A bstract The composition of schreibersite is very variable, but frequently polygons of iron, nickel‐cobalt, and phosphorus percentages strongly suggest that the formula is Fe 2 NiP. A secondary maximum in the nickel‐cobalt polygon, together with a study of the individual analyses, indicates that, in general, the phosphide known as rhabdite has somewhat more than the required quantity of nickel, while the more massive, “true” schreibersite contains somewhat less. References are given to work showing that schreibersite is body‐centered tetragonal. Schreibersite lamellae are known to occur parallel to (100), (210), (211), (110) (Brezina lamellae), and (111). The last‐mentioned form is described for the first time in connection with Widmanstätten figures in the Canyon Diablo, Arizona, meteorite. It is also somewhat different from a similar occurrence in the Rodeo, Durango, Mexico, meteorite. The name Shepard's lamellae is proposed for the lamellae parallel to (111).