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Quartzite is approximately 420 million years old.

Quartzite is a metamorphic rock made of detrital quartz grains cemented together by newly formed quartz, which makes it extremely hard.
Quartzite is formed by the metamorphism of limestone. As the quartz grains are practically the same, whether from a low or high temperature, only minor changes can take place. During their deep embedment and diagenesis, the grains of sand are joined together so strongly that fractures cross through the grains.

Quartzite is a solid and very hard rock, among the hardest and most resistant, 6.5 to 7 on the MOHS scale, composed of 5% mica and 95% quartz, the crystals of which are fused together. Its density varies between 2.3 and 2.4 kg/cm3 and its absorption rate is low, approximately 0.05%. Quartzite has similar advantages to granite but it is a cleaved rock the main characteristic of which is its conchoidal fracture (clean and smooth fracture).
Quartzite has the same colour range as limestone: brown, yellow, grey, reddish and white, including a wide variety of sparkling amber tones. The tones vary according to the organic substances that become incrusted during its formation.

Quartzite quarries can be found in Italy, Sweden and Norway (where Otta, the largest quarry in the world, is located).

This rock is used for decorative purposes.

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