Name QUARTZ
Variety CITRINE
Origin Joaquin Felicio, Minas Gerais (Brazil)
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   25 x 8,5 x 7 cm
Weight 2,38 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. Natural citrine crystals, such as this one, are rare and can command quite considerable prices. Most commercial citrines are heat-treated amethysts.


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QUARTZ



VARIETY CITRINE