Granite Slab - Menlo Park, California
Posted by: 
Volcanoguy
N 37° 27.328 W 122° 10.222
10S E 573375 N 4145723
Granite slab at the USGS Campus in Menlo Park, California.
Waymark Code: WMADH2
Location: California, United States
Date Posted: 12/31/2010
Views: 4
This granite slab is one example of a series of large blocks of rocks from various locations, which are on display around the USGS Campus in Menlo Park. There is a self-guided tour of the campus available at the visitor center.
Text of Sign: “This 275 million year old (Permian Age) medium-grained granite slab is cut by a coarse-grained pegmatite dike which is flanked by a finer-grained aplite dike. The large crystals in the pegmatite are of the same minerals as those contained in the granite slab: glassy-grey quartz, salmon-pink potassium feldspar, white plagioclase feldspar, and black biotite mica.”
Type of Display: Geological
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