Name QUARTZ
Origin Francisco Sá (Minas Gerais) Brazil
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   53x47x20 cm
Weight 32 kg




Description:
Quartz was chosen by the geologist Friedrich Mohs to represent grade 7 in his famous scale of hardness dating back to 1825, and which is still valid nowadays. Brazil is the country where one can find the most exquisite groups of rock crystal in the world.


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QUARTZ



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