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The Cr-Zr-Ca armalcolite in lunar rocks is loveringite; constraints from electron backscatter diffraction measurements
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The Cr-Zr-Ca armalcolite in lunar rocks is loveringite; constraints from electron backscatter diffraction measurements
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The Cr-Zr-Ca armalcolite in lunar rocks is loveringite; constraints from electron backscatter diffraction measurements
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Journal Article
The Cr-Zr-Ca armalcolite in lunar rocks is loveringite; constraints from electron backscatter diffraction measurements
2020
Overview
\"Cr-Zr-Ca armalcolite\" is a mineral originally found in Apollo samples five decades ago. However, no structural information has been obtained for this mineral. In this study, we report a new occurrence of \"Cr-Zr-Ca armalcolite\" and its associated mineral assemblage in an Mg-suite lithic clast (Clast-20) from the brecciated lunar meteorite Northwest Africa 8182. In this lithic clast, plagioclase (An=88-91), pyroxene (Mg#[Mg/(Mg+Fe)]=0.87-0.91) and olivine (Mg#=0.86-0.87) are the major rock-forming minerals. Armalcolite and \"Cr-Zr-Ca armalcolite\" are observed with other minor phases including ilmenite, chromite, rutile, fluorapatite, merrillite, monazite, FeNi metal, and Fe-sulfide. Based on 38 oxygen atoms, the chemical formula of \"Cr-Zr-Ca armalcolite\" is (Ca0.99Na0.01)Σ1.00(Ti14.22 Fe2.06 Cr2.01 Mg1.20 Zr0.54Al0.49 Ca0.21 Y0.05 Mn0.04 Ce0.03 Si0.03 La0.01 Nd0.01 Dy0.01)Σ20.91O38. Electron backscatter diffraction (EBSD) results reveal that the \"Cr-Zr-Ca armalcolite\" has a loveringite R3 structure, differing from the armalcolite Bbmm structure. The estimated hexagonal cell parameters a and c of \"Cr-Zr-Ca armalcolite\" are 10.55 and 20.85 Å, respectively. These structural and compositional features indicate that \"Cr-Zr-Ca armalcolite\" is loveringite, not belonging to the armalcolite family. Comparison with \"Cr-Zr-Ca armalcolite\" and loveringite of other occurrences implies that loveringite might be an important carrier of rare earth elements in lunar Mg-suite rocks. The compositional features of plagioclase and mafic silicate minerals in Clast-20 differ from those in other Mg-suite lithic clasts from Apollo samples and lunar meteorites, indicating that Clast-20 represents a new example of diverse lunar Mg-suite lithic clasts.
