Distinctive features:  
Compact, hard, very fine-grained rock, which breaks into sharp angular fragments. Quartzite is always associated with other metamorphic rocks, while cemented sandstone is always associated with other sedimentary rocks.

Colour: 
White to creamy white.

Texture and granularity: 
Granoblastic and very fine-grained.

Composition:
Interlocking sand (quartz) grains, often with silica cement.

Field associations: 
In zones of regionally metamorphosed sandstone.

Varieties:
Local varieties based on colour.

 

Worldwide.

 

Aggregate, monumental.