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Hollisterite (Al~3~Fe), kryachkoite (Al,Cu)~6~(Fe,Cu), and stolperite (AlCu): Three new minerals from the Khatyrka CV3 carbonaceous chondrite by Chi Ma; Chaney Lin; Luca Bindi; Paul J. Steinhardt is a Earth and Planetary Sciences article available to read on EtoBox.

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Our nanomineralogy investigation of the Khatyrka CV3 carbonaceous chondrite has revealed three new alloy minerals-hollisterite (IMA 2016-034; Al 3 Fe), 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 Al 2.89 Fe 0.77 Cu 0.32 Si 0.02 and a monoclinic C2/m structure with a = 15.60 Å, b = 7.94 Å, c = 12.51 Å, b = 108.1°, V = 1472.9 Å 3 , Z = 24. Kryachkoite occurs with khatyrkite and aluminum, having an empirical formula of Al 5.45 Cu 0.97 Fe 0.55 Cr 0.02 Si 0.01 and an orthorhombic Cmc2 1 structure with a = 7.460 Å, b = 6.434 Å, c = 8.777 Å, V = 421.3 Å 3 , Z = 4. Stolperite occurs within khatyrkite, or along with icosahedrite and/or hollisterite and khatyrkite, having an empirical formula of Al 1.15 Cu 0.81 Fe 0.04 and a cubic Pm3m structure with a = 2.9 Å, V = 24.4 Å 3 , 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. Hollis

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Author

Chi Ma; Chaney Lin; Luca Bindi; Paul J. Steinhardt

Publisher

Mineralogical Society of America

Published

2017

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)