The optical effects of small iron particles that darken but do not redden: Evidence of intense space weathering on Mercury

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Ion irradiation of carbonaceous chondrites: A new view of space weathering on primitive asteroids (2017, background): “Because µm-size (larger than 50 nm) iron particles production can lead to darkening without reddening (as opposed to nm-size) [Noble et al., 2007; Lucey & Riner, 2011], the authors proposed that such particles are created first in the cronstedtite sample to explain the blueing trend.”
Mercury’s Weather-Beaten Surface: Understanding Mercury in the Context of Lunar and Asteroidal Space Weathering Studies (2014, methodology): “On the basis of telescopic spectra of Mercury, they predicted that Mercury’s regolith has more and larger npFe0 grains than the Moon, whereas S-class asteroid surfaces should have slightly smaller npFe0 particles than the Moon, consistent with the paucity of agglutinates in regolith breccia meteorit”