Abstract
“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(Ti14.22Fe2.06Cr2.01 Mg1.20Zr0.54Al0.49Ca0.21Y0.05Mn0.04Ce0.03Si0.03La0.01Nd0.01Dy0.01)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.
Acknowledgments and Funding
We thank Takashi Mikouchi, an anonymous reviewer, and associate editor Steven Simon for their helpful comments that greatly improved the quality of this manuscript. This work was financially supported by the B-type strategic Priority Program of the Chinese Academy of Sciences (grant XDB41000000), a pre-research Project on Civil Aerospace Technologies funded by CNSA (grant D020204), Natural Science Foundations of China (grant 41673068) and Jiangsu Province of China (grant BK20170017).
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Articles in the same Issue
- Experimental determination of the solubility constant of kurnakovite, MgB3O3(OH)5·5H2O
- Elastic properties of majoritic garnet inclusions in diamonds and the seismic signature of pyroxenites in the Earth’s upper mantle
- Establishing a protocol for the selection of zircon inclusions in garnet for Raman thermobarometry
- Reversely zoned plagioclase in lower crustal meta-anorthosites: An indicator of multistage fracturing and metamorphism in the lower crust
- High-pressure silica phase transitions: Implications for deep mantle dynamics and silica crystallization in the protocore
- The Cr-Zr-Ca armalcolite in lunar rocks is loveringite: Constraints from electron backscatter diffraction measurements
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Articles in the same Issue
- Experimental determination of the solubility constant of kurnakovite, MgB3O3(OH)5·5H2O
- Elastic properties of majoritic garnet inclusions in diamonds and the seismic signature of pyroxenites in the Earth’s upper mantle
- Establishing a protocol for the selection of zircon inclusions in garnet for Raman thermobarometry
- Reversely zoned plagioclase in lower crustal meta-anorthosites: An indicator of multistage fracturing and metamorphism in the lower crust
- High-pressure silica phase transitions: Implications for deep mantle dynamics and silica crystallization in the protocore
- The Cr-Zr-Ca armalcolite in lunar rocks is loveringite: Constraints from electron backscatter diffraction measurements
- Effects of composition and pressure on electronic states of iron in bridgmanite
- Ti diffusion in feldspar
- Radiation-induced defects in montebrasite: An electron paramagnetic resonance study of O– hole and Ti3+ electron centers
- New IR spectroscopic data for determination of water abundances in hydrous pantelleritic glasses
- Experimental investigation of the effect of nickel on the electrical resistivity of Fe-Ni and Fe-Ni-S alloys under pressure
- An experimental approach to examine fluid-melt interaction and mineralization in rare-metal pegmatites
- Crystal-chemistry of sulfates from the Apuan Alps (Tuscany, Italy). VI. Tl-bearing alum-(K) and voltaite from the Fornovolasco mining complex
- Letter
- First-principles modeling of X-ray absorption spectra enlightens the processes of scandium sequestration by iron oxides
- Effects of the dissolution of thermal barrier coating materials on the viscosity of remelted volcanic ash
- New Mineral Names