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Green glasses collected during the Apollo 15 mission represent quenched picritic (17 to 19 wt. % MgO), very-low-Ti (0.2 to 0.4 wt. % TiO2) melts, which explosively erupted ~3.4 Gyrs ago by fire-fountaining (e.g., Podosek and Huneke, 1973; Delano, 1979, 1986; Spangler et al., 1984; Steele et al., 1992). They are among the most primitive material yet collected on the Moon (Green and Ringwood, 1973). The green glasses can be divided into discrete compositional groups, which were formed in distinct magmatic events and/or from different source regions (Delano, 1979; Steele et al., 1992).

Apollo 15 green glass He-Ne-Ar signatures – In search for indigenous lunar noble gases