Point of Rocks Quarry, Point of Rocks Mesa (Pecks Mesa), Springer, Colfax Co., New Mexico, USA

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A phonolite sill, consisting of alkali feldspar, zeolites and nepheline, which caps a mesa of olivine basalts and Cretaceous sedimentary rocks.

Refs.:
Rocks & Min.: 60:229
Tschernich, R. (1992): Zeolites of the World, 67
DeMark, R. S. (1984): Minerals of Point of Rocks, New Mexico. Mineral. Record 15, 150-156.
http://www.koeln.netsurf.de/~w.steffens/point.htm

Map Reference: 36°25'N , 104°9'W

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