Name QUARTZ
Variety QUARTZ
Origin Francisco Sa, Minas Gerais (Brazil)
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   85 x 47 x 40 cm
Weight 104 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. The specimen shown here is the largest in our collection, and although it cannot be called exceptional as there have been found specimens weighing several tons, it is quite svelte for its size and weight.


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QUARTZ



VARIETY QUARTZ