“…The pyroxenes are broadly quadrilateral in composition and abundant in lunar basalts (e.g., Papike et al, 1976;Papike & Vaniman, 1978), and olivine is generally Fo 30-80 (e.g., Wieczorek et al, 2006). Additionally, the oxide ilmenite is abundant in some mare basalts (McKay & Williams, 1979;Rutherford et al, 1980) and spinel has been shown to be an important phase based on both laboratory and remote sensing studies Marriner et al, 2014Marriner et al, , 2015Nekvasil et al, 2015;Pieters et al, 2011Pieters et al, , 2014Williams et al, 2016). Analyses of sieved bulk Apollo soils have shown an average particle size of~60 μm, with a median range between 40 and 130 μm with a depth dependence where material at the top of the regolith column has a smaller average particle size (Carrier, 1973;Heiken et al, 1973;King et al, 1971King et al, , 1972aKing et al, , 1972bMcKay et al, 1972McKay et al, , 1974.…”