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
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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