Sandstone Wikipedia
Sandstone is a clastic sedimentary rock composed mainly of sandsized ( to 2 mm) silicate grains. Sandstones comprise about 2025% 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. Like uncemented sand, sandstone may be any color due to impurities ...