Name QUARTZ
Variety QUARTZ WITH PIRITE
Origin Diamantina
Minas Gerais
Brazil
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   11 x 8 x 5 cm
Weight 700 gr




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. Quartz crystals with inclusions of pirite crystals, sometimes longer than 2 cm, coming from this deposit, are the most beautiful of and best in the world. Good specimens are rare and vey much sought after by collectors.


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QUARTZ



VARIETY QUARTZ WITH PIRITE