Quartzite is a very hard rock. 
42 words
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Sample of Quartzite.JPG
Quartzite Mine in Kakwa Park.JPG
Tutankhamun oriental institute Chicago.jpg
Biface Stellenbosch MHNT PRE 2009.0.195.1...
Metaquartzite.jpg
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Content adapted from Wikipedia
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Readability: FK 13.4
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Vital Level 5