Name QUARTZ
Variety QUARTZ FERRUGINOUS
Origin Guadalajara (Spain)
Hardness 7
Composition SiO2
Crystaline sys. TRIGONAL
Size   9 x 6,5 x 5 cm
Weight 204 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. This type of quartz, quite frequent in Spain, use to be collected by the pilgrims who walked the Road to Santiago, as a memento of their trip with the name of "Hyacinth of Compostela".


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QUARTZ



VARIETY QUARTZ FERRUGINOUS