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Mineralogy and petrology of fine‐grained samples recovered from the asteroid (162173) Ryugu
Abstract Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fine‐grained Ryugu samples allocated to our “Sand” team and report additional space weathering features found on the grains. The dominant mineralogy is composed of a fine‐grained mixture of Mg‐rich saponite and serpentine, magnetite, pyrrhotite, pentlandite, dolomite, and Fe‐bearing magnesite. These grains have mineralogy comparable to that of CI chondrites, showing severe aqueous alteration but lacking ferrihydrite and sulfate. These results are similar to previous works on large Ryugu grains. In addition to the major minerals, we also find many minerals that are rare or have not been reported among CI chondrites. Accessory minerals identified are hydroxyapatite, Mg‐Na phosphate, olivine, low‐Ca pyroxene, Mg‐Al spinel, chromite, manganochromite, eskolaite, ilmenite, cubanite, polydymite, transjordanite, schreibersite, calcite, moissanite, and poorly crystalline phyllosilicate. We also show scanning transmission electron microscope and scanning electron microscope compositional maps and images of some space‐weathered grains and severely heated and melted grains. Although our mineralogical results are consistent with that of millimeter‐sized grains, the fine‐grained fraction is best suited to investigate impact‐induced space weathering.
Petrology of eucrites, howardites and mesosiderites.
Achondrites and mesosiderites containing brecciated structures indicate magnetic differentiation, recrystallization, refragmentation and ejection from parent body
Terrestrial by-products of lunar oriented research in experimental petrology
Complex metal oxides, reentry temperature systems, and elastic wave propagation through rocks at elevated temperature and pressure
Lunar and Martian surfaces - Petrologic significance of absorption bands in the near- infrared.
Visible and near IR spectral absorption bands of moon and Mars, determining mineral abundance on surfaces
An experimental investigation of oldhamite, CaS, and the petrologic significance of oldhamite in meteorites.
Oldhamite upper stability limit in enstatite rich stony meteorites from study of CaS oxidation under controlled atmospheric and temperature conditions
Chemical and petrological investigation of the medicine lake caldera semiannual status report, period ending 31 jan. 1968
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Experimental studies on the system Fe-MgO-SiO sub 2 -O sub 2 and their bearing on the petrology of chondritic meteorites.
Oxygen partial pressure, temperature and olivine composition related, determining distribution coefficient of Fe and Mg between olivine and pyroxene
Mineralogy and petrology of silicate inclusions in iron meteorites
Silicate inclusions in iron meteorites analyzed by microprobe and classified according to phase assemblages, compositions and textures
Tenoumer crater, Mauritania - Age and petrologic evidence for origin by meteorite impact
Tenoumer crater meteorite impact origin from shock metamorphic features analysis
Mineralogy and petrology of coarse particulate material from the lunar surface at Tranquillity Base
Shock metamorphic granular mafic holocrystalline lithic fragments, microbreccia, glass and anorthosite from Apollo 11 lunar surface material at Tranquillity Base
Petrologic history of the moon inferred from petrography, mineralogy, and petrogenesis of Apollo 11 rocks
Lunar rocks petrography, mineralogy and petrogenesis from Apollo 11 samples
Iceland as an atypical example of the petrology of the Mid-Atlantic Ridge
Comparing geological relationships between various rock strata of Iceland and Mid-Atlantic Ridge
Mineralogy and petrology of Apollo 11 and Apollo 12 samples Final report
Investigating mineral composition of Apollo 11 and 12 lunar rock samples
Petrology of a fine grained igneous rock from the Sea of Tranquillity
Electron microprobe analysis of fine-grained igneous rocks from lunar sample 10022 from Sea of Tranquillity
Mineralogy and petrology of some Apollo 11 igneous rocks
Electron probe microanalysis of minerals of lunar igneous rocks from Apollo 11 flight
Preliminary report on the geology and field petrology at the Apollo 15 landing site
Apollo 15 mission and manned geologic exploration of lunar landing site - maps
Petrology of the lunar soil and geophysical implications
Apollo 11 lunar soil sample derived from basaltic and anorthositic rocks, considering basalt origin by melting due to internal radioactive heating