Braciated jasper

It is a mineral that is part of the chalcedony family, the name by which the microcrystalline varieties of quartz are referred to. Typical colouring with zoning, exceptional polishability.
Chemical composition: SiO2 + FE, O, OH, Si
Hardness: 6,5
Density: 2,6 g/cm³
Family:
Origin: Uruguay, Brasile, Italia

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