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Edscottite, Fe_5C_2, a New Iron Carbide Mineral from the Wedderburn Iron Meteorite

Ma, Chi and Rubin, Alan (2019) Edscottite, Fe_5C_2, a New Iron Carbide Mineral from the Wedderburn Iron Meteorite. Meteoritics and Planetary Science, 54 (S2). p. 6395. ISSN 1086-9379. doi:10.1111/maps.13346.

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The Wedderburn iron meteorite, found as a single 210-g mass in Victoria, Australia in 1951, is a Ni-rich ataxite belonging to subgroup sLH of the IAB complex (Low-Au, High-Ni subgroup). It is one of the most Ni-rich irons known (23.4 wt.% Ni [1]), initially classified as group IIID. During a re-investigation of a polished thick section of Wedderburn, we identified a new iron-carbide mineral, Fe5C2 with the C2/c Pd5B2-type structure, named “edscottite” (Fig. 1). Field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron back-scatter diffraction (EBSD) and electron probe microanalysis (EPMA) were used to characterize edscottite and associated phases. This mineral was first identified in Wedderburn [2,3]; synthetic Fe_5C_2 was previously known (e.g., [4-6]). We report here the first natural occurrence of Fe_5C_2 in an iron meteorite as a new carbide mineral. Edscottite (IMA 2018-086a) was approved by the IMA-CNMNC [7]. The mineral name is in honor of Edward (Ed) R. D. Scott, University of Hawai‘i, USA, for his seminal contributions to meteorite research. He discovered haxonite, (Fe,Ni)_(23)C_6 [8] as well as this new iron carbide [2,3].

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Ma, Chi0000-0002-1828-7033
Alternate Title:Edscottite, Fe5C2, a New Iron Carbide Mineral from the Wedderburn Iron Meteorite
Additional Information:© 2019 The Meteoritical Society. Issue Online: 19 June 2019; Version of Record online: 19 June 2019.
Issue or Number:S2
Record Number:CaltechAUTHORS:20190709-102156186
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Official Citation:(2019), 82nd Annual Meeting of The Meteoritical Society (2019). Meteorit Planet Sci, 54: A1-A509. doi:10.1111/maps.13346
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96994
Deposited By: Tony Diaz
Deposited On:09 Jul 2019 20:03
Last Modified:16 Nov 2021 17:25

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