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About Quartzite

The parent rock for quartzite is quartz-rich sandstone. As sandstone becomes deeply buried, rising temperature will fuse the quartz grains together forming the extremely hard and weather-resistant rock quartzite. Like marble, quartzite comes in many colors, but when pure it is light-colored. Quartzite tends to have a sugary appearance, and when broken the fractures cut through the sand grains, not around them as with a sandstone.

Physical Properties of Quartzite
Physically, they are very Hard, Compact, Fine grained, equi-granular homogeneous rocks of metamorphic nature (Quartzite).




Minor color tonal variations exist but within the tolerance limit.


6.5 to 7 on Moh's Scale


2.3 to 2.4 Kg/cm3

Compressive Strength

90 to 140 N/mm2

Modulus of Rupture

16-40 N/mm2

Water Absorption

1.0 - 1.2 %


Low to very low.

Weather Impact



Chemical Properties of Quartzite
Chemically they are very resistant Mono-Mineralic rocks, principally composed of silica. The other minor constituents vary from origin to origin.



Iron (Fe2O3)


Alumina (Al2O3)

1 to 1.5%

Soda (Na2O) & Potash (Kro)

Less then 1%

Lime (CaO)

Less then 0.5%

Magnesia (MgO)

Less then 0.5%

Loss On Ignition (LOI)

Less then 0.5%


They are highly resistant to acids, alkalies and thermal impact. Insolubility in acids and alkalies is about 97%.

Uses of Quartzite

  • Usually dyed to some pleasing color -- has been tumbled or otherwise fashioned into decorative items.

  • Quartzite is the raw material for the glass and ceramics industries

Colour of Quartzite

  • White

  • Grey

  • Reddish

Texture of Quartzite
Medium-grained; usually of a granoblastic texture

Occurances of Quartzite






Cuneo, Piedmont Region, Snive Quarry, Robilante



Deoli tonk, badnor,


Wasa Sten


Austertena (largest in world)