Distinctive features:  
Sandstone rich in feldspars. Bedding is sometimes present, but fossils are rare. It effervesces slightly in dilute hydrochloric acid, which indicates calcite cement.

Colour: 
Buff to brownish-grey or pink.

Texture and granularity: 
Usually medium-grained (2 mm / 1/16 in on average), but can be fine-grained.

Composition: 
Quartz sandstone containing over a quarter feldspar with calcie or iron oxide cement. Micas may also be present.

Field associations: 
Derived from rapid weathering, trasnportation and deposition of granitic rocks (SEE granite rocks).

 

Worldwide.

 

Building stone, millstones for grinding corn.