ijolite: Quick Facts

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alkaline rock mafic rock intrusive rock granite basalt phonolite diabase gabbro anorthosite nepheline syenite peridotite picrite lamprophyre

Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.

(Bed) Rocks and (Flint) Stones