Academic Quad-East Academic Quad-West Baker Institute Herring Hall Shepherd, RMC Cohen House and Allen Center Engineering Quad Hamman Hall, Herman Brown, and Mudd President's House Residential Colleges Science Buildings Main Page Contact		Engineering Quad   Some of the most popular stones rest in the engineering quad. These familiar granites, sculpted by Michael Heizer in 1984, are known as 45°, 90°, and 180°. Although it is not visible in this picture, you can tell by the drill holes on its side that 90° is upside down.     This picture of 180° shows the Sunset Red granite from Marble Falls, Texas. This rock came from a quarry into a large batholith exposed in the central Texas area. It is the same rock that has been used over much of the campus, and was also used for the Texas State Capitol building. Upon close examination of the beautiful granite you can see that the alkali-feldspar crystallized first, followed by the plagioclase, biotite and quartz. The modal abundances, shapes and grain sizes are as follows: K-feldspar - 45%, euahedral crystals ~3 cm quartz - 20%, subhedral ~1 cm plagioclase - 20%, subhedral ~0.5 cm biotite - 15%, subhedral ~1 cm Back to top Academic Quad-East Academic Quad-West Baker Institute, Herring Hall, Shepherd and RMC Cohen House and Allen Center Engineering Quad Hamman Hall, Herman Brown, and Mudd President's House Residential Colleges Science Buildings Main Page Department of Geology and Geophysics, Rice University, Houston.