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Carletonmooreite, Ni (sub 3) Si, a new silicide from the Norton County aubrite meteorite

Laurence A. J. Garvie, Chi Ma, Soumya Ray, Kenneth Domanik, Axel Wittmann and Meenakshi Wadhwa
Carletonmooreite, Ni (sub 3) Si, a new silicide from the Norton County aubrite meteorite
American Mineralogist (November 2021) 106 (11): 1828-1834


Carletonmooreite (IMA 2018-68), Ni (sub 3) Si, is a new nickel silicide mineral that occurs in metal nodules from the Norton County aubrite meteorite. These nodules are dominated by low-Ni iron (kamacite), with accessory schreibersite, nickelphosphide, perryite, and minor daubreelite, tetrataenite, taenite, and graphite. The chemical composition of the holotype carletonmooreite determined by wavelength-dispersive electron-microprobe analysis is (wt%) Ni 82.8 + or - 0.4, Fe 4.92 + or - 0.09, and Si 13.08 + or - 0.08 (n = 6, total = 100.81) giving an empirical formula of (Ni (sub 2.87) Fe (sub 0.18) ) (sub Sigma 3.05) Si (sub 0.95) , with an end-member formula of Ni (sub 3) Si. Further grains discovered in the specimen after the new mineral submission extend the composition, i.e., (wt%) Ni 81.44 + or - 0.82, Fe 5.92 + or - 0.93, Cu 0.13 + or - 0.02, and Si 13.01 + or - 0.1 (n = 11, total = 100.51 + or - 0.41), giving an empirical formula (Ni (sub 2.83) Fe (sub 0.22) Cu (sub 0.004) ) (sub Sigma 3.05) Si (sub 0.95) . The backscattered electron-diffraction patterns were indexed by the Pm3m auricupride (AuCu (sub 3) )-type structure and give a best fit to synthetic Ni (sub 3) Si, with a = 3.51(1) Aa, V = 43.2(4) Aa (super 3) , Z = 1, and calculated density of 7.89 g/cm (super 3) . Carletonmooreite is silver colored with an orange tinge, isotropic, with a metallic luster and occurs as euhedral to subhedral crystals 1 X 5 mu m to 5 X 14 mu m growing on tetrataenite into kamacite. The dominant silicide in the Norton County aubrite metal nodules is perryite (Ni,Fe) (sub 8) (Si,P) (sub 3) , with carletonmooreite restricted to localized growth on rare plessite fields. The isolated nature of small euhedral carletonmooreite single crystals suggests low-temperature growth via solid-state diffusion from the surrounding kamacite and epitaxial growth on the tetrataenite. This new mineral is named in honor of Carleton B. Moore, chemist and geologist, and founding director of the Center for Meteorite Studies at Arizona State University, for his many contributions to cosmochemistry and meteoritics.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 106
Serial Issue: 11
Title: Carletonmooreite, Ni (sub 3) Si, a new silicide from the Norton County aubrite meteorite
Affiliation: Arizona State University, Center for Meteorite Studies, Tempe, AZ, United States
Pages: 1828-1834
Published: 202111
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 36
Accession Number: 2021-077557
Categories: Petrology of meteorites and tektitesMineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: California Institute of Technology, USA, United StatesUniversity of Arizona Tucson, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202154
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