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Hollisterite (Al3Fe), kryachkoite (Al,Cu)6(Fe,Cu), and stolperite (AlCu): Three new minerals from the Khatyrka CV3 carbonaceous chondrite

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Veröffentlicht/Copyright: 6. März 2017
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Abstract

Our nanomineralogy investigation of the Khatyrka CV3 carbonaceous chondrite has revealed three new alloy minerals—hollisterite (IMA 2016-034; Al3Fe), kryachkoite [IMA 2016-062; (Al,Cu)6(Fe,Cu)], and stolperite (IMA 2016-033; AlCu)—in section 126A of USNM 7908. Hollisterite occurs only as one crystal with stolperite, icosahedrite, and khatyrkite, showing an empirical formula of Al2.89Fe0.77Cu0.32Si0.02 and a monoclinic C2/m structure with a = 15.60 Å, b = 7.94 Å, c = 12.51 Å, β = 108.1°, V = 1472.9 Å3, Z = 24. Kryachkoite occurs with khatyrkite and aluminum, having an empirical formula of Al5.45Cu0.97Fe0.55Cr0.02Si0.01 and an orthorhombic Cmc21 structure with a = 7.460 Å, b = 6.434 Å, c = 8.777 Å, V = 421.3 Å3, Z = 4. Stolperite occurs within khatyrkite, or along with icosahedrite and/or hollisterite and khatyrkite, having an empirical formula of Al1.15Cu0.81Fe0.04 and a cubic Pm3¯m structure with a = 2.9 Å, V = 24.4 Å3, Z = 1. Specific features of the three new minerals, and their relationships with the meteorite matrix material, add significant new evidence for the extraterrestrial origin of the Al-Cu-Fe metal phases in the Khatyrka meteorite. Hollisterite is named in honor of Lincoln S. Hollister at Princeton University for his extraordinary contributions to earth science. Kryachkoite is named in honor of Valery Kryachko who discovered the original samples of the Khatyrka meteorite in 1979. Stolperite is named in honor of Edward M. Stolper at California Institute of Technology for his fundamental contributions to petrology and meteorite research.

Acknowledgments

SEM, EBSD, and EPMA were carried out at the Caltech GPS Analytical Facility, which is supported, in part, by NSF grants NSF EAR-0318518 and DMR-0080065. We thank Laurence Garvie, Alan Rubin, and Makoto Kimura for their constructive reviews.

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Received: 2016-10-21
Accepted: 2016-11-12
Published Online: 2017-3-6
Published in Print: 2017-3-1

© 2017 by Walter de Gruyter Berlin/Boston

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