nepheline syenite: Quick Facts

Written and fact-checked by

The Information Architects of Encyclopaedia Britannica

Photos

nepheline syenite

See All Images →

Topics

intermediate rock alkaline rock intrusive rock granite trachyte phonolite diabase andesite gabbro anorthosite 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