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MINERALOGICAL RELATIONSHIPS IN SEYMOUR, A COARSE OCTAHEDRITE
Author(s) -
Drake John C.
Publication year - 1970
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1970.tb00386.x
Subject(s) - troilite , kamacite , geology , lamellar structure , mineralogy , geochemistry , materials science , meteorite , metallurgy , physics , chondrite , astronomy
Seymour is a coarse octahedrite weighing 24.5 kg. It contains two types of troilite‐graphite nodules (massive graphite nodules with irregular troilite rims, and troilite nodules with irregular, partial or total, rims of graphite); four morphologically distinct types of phosphide (lamellar, swathing, grain boundary, and rhabdite); and three types of cohenite (lamellar, swathing, and inclusions in kamacite). It is believed that lamellar and swathing schreibersite crystallized from taenite at approximately 900°C. This was followed by the crystallization of kamacite, then the development of cohenite, and finally a second period of phosphide nucleation giving rise to grain boundary schreibersite and rhabdite. Compositional data indicates that grain boundary schreibersite and rhabdite grew simultaneously.