Quartzitic Sandstone Shale
Sandstone is a clastic sedimentary rock composed mainly of sandsized (00625 to 2 mm) silicate grains Sandstones make up about 20 to 25 percent of all sedimentary rocks Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface, as seen in the ...
