Because of the highly reduced state of oxidation of the Abee meteorite, only part of its uranium is lithophile. Likewise, the constituents of the Earth's core, specifically the inner core and the “islands” of matter at the core boundary ( 21), are understandable in a causally related manner as precipitates from a highly reduced core gravitationally differentiated from enstatite-chondrite-like matter ( 14, 22). Moreover, the relative mass of the Earth's core is consistent with the Earth having been derived from highly reduced matter like that of certain enstatite chondrites ( 4, 17). The regolith of the planet Mercury, from reflectance spectroscopic investigations, appears to be highly reduced, essentially devoid of FeO-like the silicates of certain enstatite chondrites, such as the Abee meteorite ( 20). E-type asteroids (based on reflectance spectra, polarization, and albedo), the presumed source of enstatite meteorites, are radially from the sun, the innermost of the asteroids ( 19). There are reasons to associate the highly reduced matter of enstatite chondrites with the inner regions of the solar system and with the Earth.
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