Name QUARTZ
Origin Corinto (Minas Geraes) Brazil
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   74x46x26 cm
Weight 43 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. It is in the area of Corinto in Brazil where one can find the most exquisite groups of rock crystal in the world.


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QUARTZ



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