Fig. 20
Microscopic photograph shows the facing granite, plutonic, acidic igneous rock blocks of Mykerinos pyramid. The rock is medium to coarse-grained showing, equigranular, hypidiomorphic, perthitic and piokilitic texture. The rock is composed mainly of potash feldspar (microcline, orthoclase and perthite), quartz and plagioclase associated with considerable amounts of hornblende and biotite and accessory amount of muscovite, titanite, zircon and opaque minerals. Secondary minerals are represented by iron oxides sericite and clay minerals