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		Cohen House and Allen Center   Cohen House   Here is granite from the Cohen House sundial. This granite has unusual biotite inclusions in some of the large quartz grains. K-feldspar - 50%, subhedral crystals ~2 cm quartz - 20%, subhedral ~0.5 cm plagioclase - 15%, subhedral ~0.5 cm biotite - 15%, subhedral ~0.5 cm Back to the 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.