Examples of quartzite

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They link this expansion to the development of quartzite-flake technology, knowledge of which was imparted only in ceremonial contexts.
Their outlines are made of large boulders and their interiors are filled with heat-radiating quartz and quartzite river cobbles.
The lower part of the metamorphic sole is composed of kyanite and garnet-bearing mica schist, mica schist, quartzite and marble.
For example, quartzite is apparently exclusively a metamorphic rock.
The lower part, on the other hand, consists of micaschists, marble and quartzite.
In the northern domain, the sequence is predominantly quartzite.
The platform carbonates unconformably overlie much older quartzites (at top of photograph).
Note the increase of grain size distribution due to refinement of some grains and porosity decrease compared to the undeformed quartzite in (a).
Discussion: crossed girdle c-axis fabrics in quartzites plastically deformed by plain strain and in progressive simple shear.
Medium-grained sandstones (protoquartzite) contain quite well-rounded quartz grains, quartzite lithoclasts, muscovite, plagioclase (rare) and bioclasts, especially echinoderm plates, cemented by calcite spar.
The present day petrography of this formation shows a medium-grained and well-sorted quartzite with syntaxial quartz cements and virtually zero porosity.
An increase in the limestone element is typically marked by a concomitant reduction in the psammitic and quartzite component.

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