Sandstone n. : A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Example:
Sandstone.....................?

Taxonomy
sandstone, sand, rock, grains, minerals, grain sizes, quartz, feldspar, fragments, fine-grained, sandstone formation, quartz sandstones, free encyclopedia, red sandstone, sand grains, Sedimentary Rock, composition, Origins.

Defination from the web:
sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any color, but the most common colors are tan, brown, yellow, red, gray and white. ...